APA (7th ed.) Zitazioa

Gardiner, C. (1994). An introduction to geology. DPH.

Chicago Style (17th ed.) Zitazioa

Gardiner, C.I. An Introduction to Geology. New Delhi: DPH, 1994.

MLA (9th ed.) Zitazioa

Gardiner, C.I. An Introduction to Geology. DPH, 1994.