APA (7th ed.) Citation

L, D. (2009). Games, gamers, & gaming. Why games? Library Journal, 134(9), 50.

Chicago Style (17th ed.) Citation

L, Danforth. "Games, Gamers, & Gaming. Why Games?" Library Journal 134, no. 9 (2009): 50.

MLA (9th ed.) Citation

L, Danforth. "Games, Gamers, & Gaming. Why Games?" Library Journal, vol. 134, no. 9, 2009, p. 50.