Ries, A. (2007). The 22 Immutable Laws of Marketing. Quercus Publishing Ltd.
Lua i Stíl Chicago (17ú heag.)Ries, Al. The 22 Immutable Laws of Marketing. London: Quercus Publishing Ltd, 2007.
Lua MLA (9ú heag.)Ries, Al. The 22 Immutable Laws of Marketing. Quercus Publishing Ltd, 2007.
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