APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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