Gaya APA

Amacher, R, C., Ulbrich, H, H. (1986). Principles of macroeconomics m . cincinnati, Ohio: South-Wstern Pub. Co..

Gaya MLA

Amacher, Ryan, C., Ulbrich, H., Holley. "Principles of macroeconomics m". cincinnati, Ohio: South-Wstern Pub. Co., 1986. Text.