APA (7th ed.) Citation

Rufener, L. A. (1927). Principles of economics. Houghton.

Chicago Style (17th ed.) Citation

Rufener, L. A. Principles of Economics. Boston, New York [etc.]: Houghton, 1927.

MLA (9th ed.) Citation

Rufener, L. A. Principles of Economics. Houghton, 1927.