APA (7th ed.) Zitazioa
Lehmann, D. R. (1989). Market research and analysis (3rd ed.). Irwin.
Chicago Style (17th ed.) Zitazioa
Lehmann, Donald R. Market Research and Analysis. 3rd ed. Homewood, IL.: Irwin, 1989.
MLA (9th ed.) Zitazioa
Lehmann, Donald R. Market Research and Analysis. 3rd ed. Irwin, 1989.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.