APA aipamena

Duncan, D. J., & Hollander, S. C. (1979). Programmed learning aid for retailing: Modern concepts and practices (3rd ed.). Learning Systems.

Chicago Style aipamena

Duncan, Delbert J., and Stanley C. Hollander. Programmed Learning Aid for Retailing: Modern Concepts and Practices. 3rd ed. Homewood, Ill: Learning Systems, 1979.

MLA aipamena

Duncan, Delbert J., and Stanley C. Hollander. Programmed Learning Aid for Retailing: Modern Concepts and Practices. 3rd ed. Learning Systems, 1979.