Czepiel, J. A. (1992). Competitive Marketing Strategy. Prentice - Hall.
Lua i Stíl Chicago (17ú heag.)Czepiel, John A. Competitive Marketing Strategy. Prentice - Hall, 1992.
Lua MLA (8ú heag.)Czepiel, John A. Competitive Marketing Strategy. Prentice - Hall, 1992.
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