Duncan, D. J. (1979). Programmed learning aid for retailing: Modern concepts and ractices. Learning System.
Chicago Style (17th ed.) CitationDuncan, Delbert J. Programmed Learning Aid for Retailing: Modern Concepts and Ractices. Homewood, III.: Learning System, 1979.
MLA (9th ed.) CitationDuncan, Delbert J. Programmed Learning Aid for Retailing: Modern Concepts and Ractices. Learning System, 1979.
Warning: These citations may not always be 100% accurate.