Citação norma APA

Duncan, D. J. (1974). Programmed learning aid for retailing: Modern concepts and practices. Learning Systems Company.

Citação norma Chicago

Duncan, Delbert J. Programmed Learning Aid for Retailing: Modern Concepts and Practices. Homewood, Illinois: Learning Systems Company, 1974.

Citação norma MLA

Duncan, Delbert J. Programmed Learning Aid for Retailing: Modern Concepts and Practices. Learning Systems Company, 1974.

Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.