Citazione Stile APA (7a Edizione)

Hildebrand, W., & MacCaffray, C. J. (1963). The United States of America: A brief regional geography. Holt, Rinehart and Winston.

Citazione stile Chigago Style (17a edizione)

Hildebrand, William, e C. J. MacCaffray. The United States of America: A Brief Regional Geography. Toronto [u.a.]: Holt, Rinehart and Winston, 1963.

Citatione MLA (9a ed.)

Hildebrand, William, e C. J. MacCaffray. The United States of America: A Brief Regional Geography. Holt, Rinehart and Winston, 1963.