Kotler, P. (1980). Principles of marketing. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Kotler, Philip. Principles of Marketing. Englewood Cliffs, N.J.: Prentice-Hall, 1980.
Lua MLA (8ú heag.)Kotler, Philip. Principles of Marketing. Prentice-Hall, 1980.
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