Cita APA (7a ed.)

RYAN, W. T. (1980). Personal Learning Aid For Principles Of Marketing William T Ryan. Dow Jones Irwin.

Cita Chicago Style (17a ed.)

RYAN, William T. Personal Learning Aid For Principles Of Marketing William T Ryan. Dow Jones Irwin, 1980.

Cita MLA (8a ed.)

RYAN, William T. Personal Learning Aid For Principles Of Marketing William T Ryan. Dow Jones Irwin, 1980.