APA (7th ed.) Zitazioa
Catherwood, F. (1979). First things first. Intervarsity.
Chicago Style (17th ed.) Zitazioa
Catherwood, Frederick. First Things First. Illinois: Intervarsity, 1979.
MLA (9th ed.) Zitazioa
Catherwood, Frederick. First Things First. Intervarsity, 1979.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.