APA (7th ed.) Zitazioa
Ballard, E. G. (1971). Philosophy at the crossroads. Louisiana State University Press.
Chicago Style (17th ed.) Zitazioa
Ballard, Edward G. Philosophy at the Crossroads. Baton Rouge: Louisiana State University Press, 1971.
MLA (9th ed.) Zitazioa
Ballard, Edward G. Philosophy at the Crossroads. Louisiana State University Press, 1971.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.