Cita APA (7th ed.)
Ruffin, R. j., & Gregory, P. R. (1983). Principles of macroeconomics. Scott, Foresman.
Cita Chicago (17th ed.)
Ruffin, Roy j., i Paul R. Gregory. Principles of Macroeconomics. Glenview, Illinois: Scott, Foresman, 1983.
Cita MLA (9th ed.)
Ruffin, Roy j., i Paul R. Gregory. Principles of Macroeconomics. Scott, Foresman, 1983.
Atenció: Aquestes cites poden no estar 100% correctes.