APA (7th ed.) Citation

Gemmell, J., & Balsley, H. L. (1953). Principles of economics. Heath.

Chicago Style (17th ed.) Citation

Gemmell, James, and Howard Lloyd Balsley. Principles of Economics. Boston [etc.]: Heath, 1953.

MLA (9th ed.) Citation

Gemmell, James, and Howard Lloyd Balsley. Principles of Economics. Heath, 1953.