APA (7th ed.) Zitazioa
Freedman, J. L. (1975). Crowding and behavior. W.H. Freeman and Company.
Chicago Style (17th ed.) Zitazioa
Freedman, Jonathan L. Crowding and Behavior. San Francisco, EUA: W.H. Freeman and Company, 1975.
MLA (9th ed.) Zitazioa
Freedman, Jonathan L. Crowding and Behavior. W.H. Freeman and Company, 1975.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.