Dyfyniad APA

Montgomery, C. W. (1994). Earth: Then and now (2nd ed.). Wm. C. Brown.

Dyfyniad Arddull Chicago

Montgomery, Carla W. Earth: Then and Now. 2nd ed. Dubuque, Iowa: Wm. C. Brown, 1994.

Dyfyniad MLA

Montgomery, Carla W. Earth: Then and Now. 2nd ed. Wm. C. Brown, 1994.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.