APA-ийн эшлэл(7 дахь хэвлэлт)

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

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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

MLA -ийн эшлэл (9 дэх хэвлэлт)

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