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'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.
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]
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.
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.
DiComo, 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]