Duncan, D. J. (1974). Programmed learning aid for retailing: Modern concepts and practices. Learning Systems Company.
Chicago Style (17th ed.) CitationDuncan, Delbert J. Programmed Learning Aid for Retailing: Modern Concepts and Practices. Homewood, Illinois: Learning Systems Company, 1974.
ציטוט MLADuncan, Delbert J. Programmed Learning Aid for Retailing: Modern Concepts and Practices. Learning Systems Company, 1974.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.