APA (7th ed.) Citation

Lange, O., & Walker, A. H. (1963). Political economy. MacMillan.

Chicago Style (17th ed.) Citation

Lange, Oskar, and A H. Walker. Political Economy. New York: MacMillan, 1963.

MLA (9th ed.) Citation

Lange, Oskar, and A H. Walker. Political Economy. MacMillan, 1963.