Citazione Stile APA (7a Edizione)

(1989). U.S. medical directory (8th ed.). U.S. Directory Service.

Citazione stile Chigago Style (17a edizione)

U.S. Medical Directory. 8th ed. Miami, Fla.: U.S. Directory Service, 1989.

Citatione MLA (8a ed.)

U.S. Medical Directory. 8th ed. U.S. Directory Service, 1989.