APA (7th ed.) Citation

Gemmill, P. F., & Blodgett, R. H. (1947). Current economic problems (3d ed.). Harper.

Chicago Style (17th ed.) Citation

Gemmill, Paul F., and Ralph H. Blodgett. Current Economic Problems. 3d ed. New York, London: Harper, 1947.

MLA (9th ed.) Citation

Gemmill, Paul F., and Ralph H. Blodgett. Current Economic Problems. 3d ed. Harper, 1947.