Dyfyniad APA

Ries, A. (2007). The 22 Immutable Laws of Marketing. Quercus Publishing Ltd.

Dyfyniad Arddull Chicago

Ries, Al. The 22 Immutable Laws of Marketing. London: Quercus Publishing Ltd, 2007.

Dyfyniad MLA

Ries, Al. The 22 Immutable Laws of Marketing. Quercus Publishing Ltd, 2007.

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