APA (7th ed.) Citation

Gemmill, P. F. (1939). Fundamentals of economics: A textbook for introductory college courses in economic principles (3d ed.). Harper.

Chicago Style (17th ed.) Citation

Gemmill, Paul F. Fundamentals of Economics: A Textbook for Introductory College Courses in Economic Principles. 3d ed. New York, London: Harper, 1939.

MLA (9th ed.) Citation

Gemmill, Paul F. Fundamentals of Economics: A Textbook for Introductory College Courses in Economic Principles. 3d ed. Harper, 1939.