Tull, D. S. (2002). Marketing research: Measurement & method (6th ed.). Prentice hall od India.
Chicago Edition CitationTull, Donald S. Marketing Research: Measurement & Method. 6th ed. New Delhi: Prentice hall od India, 2002.
MLA Edition CitationTull, Donald S. Marketing Research: Measurement & Method. 6th ed. Prentice hall od India, 2002.
Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.