APA (7th ed.) Citation

Ryan, W. T. (1980). Programmed learning aid for principles of marketing. Lerarning Syatem Company.

Chicago Style (17th ed.) Citation

Ryan, William T. Programmed Learning Aid for Principles of Marketing. Lerarning Syatem Company, 1980.

MLA (8th ed.) Citation

Ryan, William T. Programmed Learning Aid for Principles of Marketing. Lerarning Syatem Company, 1980.

Warning: These citations may not always be 100% accurate.