APA aipamena

Gregory, P. R. (1999). Comparative economic systems. Houghton Mifflin.

Chicago Style aipamena

Gregory, Paul R. Comparative Economic Systems. Houghton Mifflin, 1999.

MLA aipamena

Gregory, Paul R. Comparative Economic Systems. Houghton Mifflin, 1999.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.