Ries, A. (2022). Positioning: The battle for your mind (3th.). McGraw Hill, New Delhi.
Lua i Stíl Chicago (17ú heag.)Ries, AL. Positioning: The Battle for Your Mind. 3th. McGraw Hill, New Delhi, 2022.
Lua MLA (9ú heag.)Ries, AL. Positioning: The Battle for Your Mind. 3th. McGraw Hill, New Delhi, 2022.
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