Dyfyniad APA

Pfeiffer, W. S., & Keller, C. H. (2000). Proposal writing: The art of friendly and winning persuasion. Prentice Hall.

Dyfyniad Arddull Chicago

Pfeiffer, William S., and Charles H. Keller. Proposal Writing: The Art of Friendly and Winning Persuasion. Upper Saddle River, NJ: Prentice Hall, 2000.

Dyfyniad MLA

Pfeiffer, William S., and Charles H. Keller. Proposal Writing: The Art of Friendly and Winning Persuasion. Prentice Hall, 2000.

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