APA aipamena

Guell, R. C., & Robert C. Guell. (2010). Issues in economics today. Boston: McGraw-Hill/Irwin.

Chicago Style aipamena

Guell, Robert C., và Robert C. Guell. Issues in Economics Today. Boston: McGraw-Hill/Irwin, 2010.

MLA aipamena

Guell, Robert C., và Robert C. Guell. Issues in Economics Today. Boston: McGraw-Hill/Irwin, 2010.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.