Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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