Lua APA (7ú heag.)

TULL DONALD S. (1990). MARKETING RESEARCH: MEASUREMENT & METHOD (5TH.). MACMILLAN.

Lua i Stíl Chicago (17ú heag.)

TULL DONALD S. MARKETING RESEARCH: MEASUREMENT & METHOD. 5TH. NEW YORK: MACMILLAN, 1990.

Lua MLA (9ú heag.)

TULL DONALD S. MARKETING RESEARCH: MEASUREMENT & METHOD. 5TH. MACMILLAN, 1990.

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