APA aipamena

Fontaine, E. O. Collier's Encyclopedia: FER-GEO.

Chicago Style aipamena

Fontaine, Everett O. Collier's Encyclopedia: FER-GEO.

MLA aipamena

Fontaine, Everett O. Collier's Encyclopedia: FER-GEO.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.