由於20-20-20俱樂部難以達成使其成員稀少,因此棒球文摘(英语:Baseball Digest)在1979年將其評為「美國職棒大聯盟裡最獨特的俱樂部」(the most exclusive club in the Majors)[22],而20-20-20俱樂部在當時僅有四名成員。俱樂部現有成員中有五人具有棒球名人堂的資格,其中三人已名列其中(英语:List of members of the Baseball Hall of Fame)(有兩人在第一次票選中就被選上)[23]。球員必須要至少有十年以上大聯盟資歷,並至少要在退休後五年或是逝世六個月後才有票選資格[24]。剩下兩名球員因為他們退休未滿五年而尚未擁有入選名人堂的資格。
^Statistics. Baseball Digest (Evanston, Illinois: Century Publishing). May 1990, 49 (5): 8 [2012-07-06]. ISSN 0005-609X. How many players have had 20 or more doubles, triples, and home rune in the same season? ... To further narrow the 20–20–20 club, has anybody else, besides Mays added 20 stolen bases ...
^Koppett, Leonard. At Second, He's First In the Class. The New York Times. 1990-07-09 [2012-08-09]. (原始内容存档于2020-11-05). The first year, I almost made the 20-20-20 club: I had 19 triples and 19 homers, and more than 20 stolen bases.
^Granderson joins elite homer-double-triple club, helping Tigers beat Seattle. USA Today. Associated Press. 2007-09-07 [2012-08-11]. Granderson [was] just the sixth player since 1900 with at least 20 home runs, 20 doubles and 20 triples in one season..., join[ing] the 20-20-20 club.
^Harrigan, Thomas. No player has joined this exclusive club since '07. MLB.com (MLB Advanced Media). 2020-03-15 [2020-05-24]. (原始内容存档于2020-04-19).
^Nemec, David. Incredible Baseball Trivia: More Than 200 Hardball Questions for the Thinking Fan. Simon and Schuster. 2019-03-05: 138 [2020-09-17]. ISBN 9781683582342. (原始内容存档于2020-09-18).
^Granderson's 20th steal puts Tigers center fielder in select company. ESPN (ESPN Internet Ventures). Associated Press. 2007-09-09 [2010-12-08]. (原始内容存档于2014-02-23). Granderson has 22 triples—the most by a Tiger since Ty Cobb had 24 in 1917—and 36 doubles. He hit his 20th homer Friday, becoming the sixth player since 1900 in the 20-20-20 club and the first since Kansas City's George Brett in 1979.
^Career Leaders & Records for Hits. Baseball-Reference.com. Sports Reference. [2012-05-08]. (原始内容存档于2012-10-14).
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^ 9.09.19.29.3Jimmy Rollins Statistics and History. Baseball-Reference.com. Sports Reference. [2012-05-08]. (原始内容存档于2019-08-14).
^ 10.010.110.2Frank Schulte Statistics and History. Baseball-Reference.com. Sports Reference. [2012-05-08]. (原始内容存档于2020-10-19).
^ 11.011.1Jim Bottomley Statistics and History. Baseball-Reference.com. Sports Reference. [2012-05-08]. (原始内容存档于2014-01-22).
^Dorfman, John. His 30–30 club has 5 stocks as stars. Omaha.com (Bloomberg News). 2011-04-17 [2012-06-24]. (原始内容存档于2013-01-31). In baseball, the club is for ballplayers who belt 30 home runs and steal 30 bases in the same season.
^Deane, Bill. Here Are Top Candidates To Join Elite '30-30' Club. Baseball Digest (Evanston, Illinois: Century Publishing). May 1987, 46 (5): 34 [2012-07-06]. ISSN 0005-609X. In 1956, Willie Mays became the second player to score a 30-30 season; a year later, he became the first to turn the trick twice.[失效連結]
^Jasner, Andy. Rollins joins 30-30 club for first time. MLB.com. MLB Advanced Media. 2007-09-25 [2012-06-24].[失效連結]
^ 15.015.1George Brett Statistics and History. Baseball-Reference.com. Sports Reference. [2012-05-08]. (原始内容存档于2011-04-25).
^Associated Press. Baseball: Rollins joins 20-20-20-20 club. Honolulu Advertiser. 2007-09-30 [2010-12-08]. (原始内容存档于2020-09-13). Phillies star Jimmy Rollins tripled against Washington on today and joined Curtis Granderson, Willie Mays and Frank "Wildfire" Schulte as the only players in major league history with 20 stolen bases, 20 homers, 20 triples and 20 doubles.
^Kirby, Tim. Granderson steals way to elite class. MLB.com. MLB Advanced Media. 2007-09-09 [2012-06-16]. (原始内容存档于2016-03-03).
^Tigers lock up outfielder Granderson with five-year, $30.25M deal. ESPN. ESPN Internet Ventures. 2008-02-04 [2012-06-16]. (原始内容存档于2008-02-08). He joined Willie Mays and Frank "Wildfire" Schulte as the only players in major league history with 20 steals, 20 homers, 20 triples and 20 doubles. Philadelphia shortstop Jimmy Rollins became a part of the 20-20-20-20 club later in the season.
^Koney, Jackie; Silva, Deidre. It Takes More Than Balls: The Savvy Girls' Guide to Understanding and Enjoying Baseball. Skyhorse Publishing. 2008: 66–67 [2011-09-23]. ISBN 978-1-60239-631-9. (原始内容存档于2020-08-03).
^Grant, Evan. Bengie Molina on cycle: 'Being slow has never been a joke for me'. Dallas Morning News. 2010-07-16 [2012-06-23]. (原始内容存档于2012-01-30).
^ 21.021.1DiComo, Anthony. Reyes turning the triple into an art form. MLB.com. MLB Advanced Media. 2011-06-20 [2012-06-23]. Citi Field['s] high walls and quirky outfield dimensions...has certainly played a role in the frequency of Reyes' triples, not only allowing a greater percentage of them to fall safely on the outfield grass, but also ensuring that only a few of his line drives will clear the fence for homers. The only thing a hitter can control...is his baserunning effort[失效連結]
^Wertz, Dennis M. The Most Exclusive Club in the Majors: Since 1900, only four players have collected 20 doubles, triples, and homers in one season. Baseball Digest (Evanston, Illinois: Century Publishing). October 1979, 38 (10): 60–61 [2012-07-06]. ISSN 0005-609X. It may sound like an eye test for a three-eyed monster in a sci-fi movie, but the combination of 20-20-20 is the criterion for membership in one of baseball's most exclusive clubs.
^Baseball Hall of Fame Inductees. Baseball-Reference.com. Sports Reference LLC. [2016-11-07]. (原始内容存档于2020-11-27).
^Rules for Election. National Baseball Hall of Fame and Museum. [2016-10-08]. (原始内容存档于2010-05-30).
^Jeff Heath Statistics and History. Baseball-Reference.com. Sports Reference. [2012-05-08]. (原始内容存档于2019-04-02).
^ 26.026.1Willie Mays Statistics and History. Baseball-Reference.com. Sports Reference. [2012-05-08]. (原始内容存档于2009-04-13).
^ 27.027.1Curtis Granderson Statistics and History. Baseball-Reference.com. Sports Reference. [2012-05-08]. (原始内容存档于2020-11-12).