Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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