Worcester, R. M. (1975). Consumer market research handbook. McGraw-Hill.
Chicago Style aipamenaWorcester, Robert M. Consumer Market Research Handbook. New York: McGraw-Hill, 1975.
MLA aipamenaWorcester, Robert M. Consumer Market Research Handbook. McGraw-Hill, 1975.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.