APA (7th ed.) Zitazioa
Dreikurs, R. (1990). The challenge of marriage. Accelerated Development.
Chicago Style (17th ed.) Zitazioa
Dreikurs, Rudolf. The Challenge of Marriage. Philadelphia: Accelerated Development, 1990.
MLA (9th ed.) Zitazioa
Dreikurs, Rudolf. The Challenge of Marriage. Accelerated Development, 1990.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.