APA (7th ed.) Citation

Harlow, R. V. (1949). The United States: From wilderness to world power. H. Holt.

Chicago Style (17th ed.) Citation

Harlow, Ralph Volney. The United States: From Wilderness to World Power. New York: H. Holt, 1949.

MLA (9th ed.) Citation

Harlow, Ralph Volney. The United States: From Wilderness to World Power. H. Holt, 1949.