APA (7th ed.) Zitazioa

Packard, W. V. (1988). Sale and purchase. Fairplay.

Chicago Style (17th ed.) Zitazioa

Packard, William V. Sale and Purchase. Londres: Fairplay, 1988.

MLA (9th ed.) Zitazioa

Packard, William V. Sale and Purchase. Fairplay, 1988.