Fisk, G. (1967). Marketing systems; an introductory analysis. Harper & Row.
Lua i Stíl Chicago (17ú heag.)Fisk, George. Marketing Systems; an Introductory Analysis. New York: Harper & Row, 1967.
Lua MLA (9ú heag.)Fisk, George. Marketing Systems; an Introductory Analysis. Harper & Row, 1967.
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