APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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