SCHAFFER ROBERT. (1986). MARKETING TOOLKIT: COMPUTER APPLICATIONS FOR MARKETING PRINCIPLES. ADDISON-WESLEY.
Chicago Style aipamenaSCHAFFER ROBERT. MARKETING TOOLKIT: COMPUTER APPLICATIONS FOR MARKETING PRINCIPLES. MASSACHUSETTS: ADDISON-WESLEY, 1986.
MLA aipamenaSCHAFFER ROBERT. MARKETING TOOLKIT: COMPUTER APPLICATIONS FOR MARKETING PRINCIPLES. ADDISON-WESLEY, 1986.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.