APA (7th ed.) Zitazioa
Frederick, R. W. (1965). Student activities in american education.
Chicago Style (17th ed.) Zitazioa
Frederick, Robert W. Student Activities in American Education. 1965.
MLA (9th ed.) Zitazioa
Frederick, Robert W. Student Activities in American Education. 1965.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.