Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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