Bearden, W. O. O. (2007). Marketing: Principles & Pesspectives (5th.). McGraw-Hill Publ.
Lua i Stíl Chicago (17ú heag.)Bearden, William O.& Others. Marketing: Principles & Pesspectives. 5th. Boston: McGraw-Hill Publ, 2007.
Lua MLA (9ú heag.)Bearden, William O.& Others. Marketing: Principles & Pesspectives. 5th. McGraw-Hill Publ, 2007.
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