Holmes, P. M. (1966). Marketing research; principles and readings. South-Western Pub.
Lua i Stíl Chicago (17ú heag.)Holmes, Peter M. Marketing Research; Principles and Readings. Cincinnati: South-Western Pub, 1966.
Lua MLA (9ú heag.)Holmes, Peter M. Marketing Research; Principles and Readings. South-Western Pub, 1966.
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