APA Edition Citation

Ryan, W. T. (1971). Programmed learning aid for principles of marketing. Learning systems company.

Chicago Edition Citation

Ryan, William T. Programmed Learning Aid for Principles of Marketing. Illinois: Learning systems company, 1971.

MLA Edition Citation

Ryan, William T. Programmed Learning Aid for Principles of Marketing. Learning systems company, 1971.

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