APA (7th ed.) Zitazioa

Duncan, D. J. (1979). Programmed learning aid for retailing: Modern concepts and ractices. Learning System.

Chicago Style (17th ed.) Zitazioa

Duncan, Delbert J. Programmed Learning Aid for Retailing: Modern Concepts and Ractices. Homewood, III.: Learning System, 1979.

MLA (9th ed.) Zitazioa

Duncan, Delbert J. Programmed Learning Aid for Retailing: Modern Concepts and Ractices. Learning System, 1979.