Dyfyniad APA

Thompson, G. (2007). Earth science and environment. Belmont, CA: Thomson Brooks/Cole.

Dyfyniad Arddull Chicago

Thompson, Graham. Earth Science and Environment. Belmont, CA: Thomson Brooks/Cole, 2007.

Dyfyniad MLA

Thompson, Graham. Earth Science and Environment. Belmont, CA: Thomson Brooks/Cole, 2007.

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