APA način citiranja

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

Čikaški stil citiranja

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

MLA način citiranja

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