Armstrong, G. (2003). Marketing: An introduction ed.6 [ada cd]. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Armstrong, Gary. Marketing: An Introduction Ed.6 [ada Cd]. Prentice Hall, 2003.
Lua MLA (8ú heag.)Armstrong, Gary. Marketing: An Introduction Ed.6 [ada Cd]. Prentice Hall, 2003.
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