Ries, A. (2002). Positioning: The battle for your mind. Salemba Empat.
Lua i Stíl Chicago (17ú heag.)Ries, Al. Positioning: The Battle for Your Mind. Salemba Empat, 2002.
Lua MLA (8ú heag.)Ries, Al. Positioning: The Battle for Your Mind. Salemba Empat, 2002.
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