APA-viite (7. p.)
ebrary, Inc. (2003). Proven tactics in viral marketing: Online games, quizzes, eCards, contests & "buzz" building. MarketingSherpa, Inc..
Chicago-viite (17. p.)
ebrary, Inc. Proven Tactics in Viral Marketing: Online Games, Quizzes, ECards, Contests & "Buzz" Building. Portsmouth, R.I.: MarketingSherpa, Inc., 2003.
MLA-viite (9. p.)
ebrary, Inc. Proven Tactics in Viral Marketing: Online Games, Quizzes, ECards, Contests & "Buzz" Building. MarketingSherpa, Inc., 2003.
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