APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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