Montgomery, C. W., & Dathe, D. (1994). Earth: Then and now (2nd ed.). Wm. C. Brown.
Chicago Style (17th ed.) ZitazioaMontgomery, Carla W., eta David Dathe. Earth: Then and Now. 2nd ed. Dubuque, Iowa: Wm. C. Brown, 1994.
MLA (9th ed.) ZitazioaMontgomery, Carla W., eta David Dathe. Earth: Then and Now. 2nd ed. Wm. C. Brown, 1994.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.