APA (7th ed.) Citation

Ault, O. C., & Eberling, E. J. (1936). Principles and problems of economics. Longmans, Green and co..

Chicago Style (17th ed.) Citation

Ault, Otho Clifford, and Ernest J. Eberling. Principles and Problems of Economics. New York, London [etc.]: Longmans, Green and co., 1936.

MLA (9th ed.) Citation

Ault, Otho Clifford, and Ernest J. Eberling. Principles and Problems of Economics. Longmans, Green and co., 1936.