Gaya APA

RUFFIN, R, J., Gregory, P, R. (1983). Principles of Macroeconomics (First Published). Glenview, Illinois: Scott, Foresman and Company.

Gaya MLA

RUFFIN, Roy, J.., Gregory, Paul, R.. "Principles of Macroeconomics". First Published Glenview, Illinois: Scott, Foresman and Company, 1983. Text.