APA (7th ed.) Zitazioa
Goh, C. L. Certificate Physical and Human Geography (Nueva ed.). Oxford University.
Chicago Style (17th ed.) Zitazioa
Goh, Chen Leong. Certificate Physical and Human Geography. Nueva ed. Nueva Delhi, India: Oxford University.
MLA (9th ed.) Zitazioa
Goh, Chen Leong. Certificate Physical and Human Geography. Nueva ed. Oxford University.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.