APA (7th ed.) Citation

Usher, R. G. (1916). The challenge of the future: A study in American foreign policy. Houghton Mifflin company.

Chicago Style (17th ed.) Citation

Usher, Roland G. The Challenge of the Future: A Study in American Foreign Policy. Boston, New York: Houghton Mifflin company, 1916.

MLA (9th ed.) Citation

Usher, Roland G. The Challenge of the Future: A Study in American Foreign Policy. Houghton Mifflin company, 1916.