Cita APA (7th ed.)
Lumsden, K., Attiyeh, R., Bach, G. L., Ritter, U. P., & Rühmann, P. (1973). Makroökonomie: Macroeconomics, a programmed book. Deutsch.
Cita Chicago (17th ed.)
Lumsden, Keith, Richard Attiyeh, George Leland Bach, Ulrich Peter Ritter, i Peter Rühmann. Makroökonomie: Macroeconomics, a Programmed Book. Zürich, Frankfurt/M: Deutsch, 1973.
Cita MLA (9th ed.)
Lumsden, Keith, et al. Makroökonomie: Macroeconomics, a Programmed Book. Deutsch, 1973.
Atenció: Aquestes cites poden no estar 100% correctes.