Boyd, H. W., & Westfall, R. L. (1960). Evaluation of continuous consumer panels as a source of marketing information. American Marketing Association.
Chicago-referens (17:e uppl.)Boyd, Harper W., och Ralph L. Westfall. Evaluation of Continuous Consumer Panels as a Source of Marketing Information. [Chicago]: American Marketing Association, 1960.
MLA-referens (9:e uppl.)Boyd, Harper W., och Ralph L. Westfall. Evaluation of Continuous Consumer Panels as a Source of Marketing Information. American Marketing Association, 1960.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.