APA aipamena

 Frank, R. H. (2007).  Principles of economics.  McGraw-Hill/Irwin.

Chicago Style aipamena

 Frank, Robert H.  Principles of Economics.  McGraw-Hill/Irwin, 2007.

MLA aipamena

 Frank, Robert H.  Principles of Economics.  McGraw-Hill/Irwin, 2007.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.