Dyfyniad APA

Kleppner, O., Lane, W. R., Russell, T., & Verrill, G. (1988). Otto Kleppner's advertising procedures (10th ed.). Prentice Hall.

Dyfyniad Arddull Chicago

Kleppner, Otto, W. Ronald Lane, Thomas Russell, and Glenn Verrill. Otto Kleppner's Advertising Procedures. 10th ed. Englewood Cliffs, N.J: Prentice Hall, 1988.

Dyfyniad MLA

Kleppner, Otto, et al. Otto Kleppner's Advertising Procedures. 10th ed. Prentice Hall, 1988.

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