Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.