Gaya APA

GEMMILL, P, F., H.Blodgett,Ph.D., R. (1948). ECONOMICS PRINCIPLES AND PROBLEMS (3rd). New York: HARPER & ROW.

Gaya MLA

GEMMILL, Paul, F.., H.Blodgett,Ph.D., Ralph. "ECONOMICS PRINCIPLES AND PROBLEMS". 3rd New York: HARPER & ROW, 1948. Textbook.