Bearden, W. O. (1998). Marketing Principles And Perspective William O. Bearden, Thomas N. Ingram, Raymond W. Laforge. Irwin.
Lua i Stíl Chicago (17ú heag.)Bearden, William O. Marketing Principles And Perspective William O. Bearden, Thomas N. Ingram, Raymond W. Laforge. Irwin, 1998.
Lua MLA (8ú heag.)Bearden, William O. Marketing Principles And Perspective William O. Bearden, Thomas N. Ingram, Raymond W. Laforge. Irwin, 1998.
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