APA aipamena

Frank, R. H. (2004). Principles of economics. McGraw-Hill.

Chicago Style aipamena

Frank, Robert H. Principles of Economics. McGraw-Hill, 2004.

MLA aipamena

Frank, Robert H. Principles of Economics. McGraw-Hill, 2004.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.