APA (7th ed.) Zitazioa
Kroner, R. (1957). Speculation in Pre-Christian philosophy. Longmans, Green.
Chicago Style (17th ed.) Zitazioa
Kroner, Richard. Speculation in Pre-Christian Philosophy. London [usw.]: Longmans, Green, 1957.
MLA (9th ed.) Zitazioa
Kroner, Richard. Speculation in Pre-Christian Philosophy. Longmans, Green, 1957.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.