Citazione APA

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

Stile di citazione Chicago

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

Citazione MLA

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

Attenzione: Queste citazioni potrebbero non essere precise al 100%.