Dyfyniad APA

Scientific American. (1969). Readings in the earth science (14th ed.). W H Freeman.

Dyfyniad Arddull Chicago

Scientific American. Readings in the Earth Science. 14th ed. San Francisco: W H Freeman, 1969.

Dyfyniad MLA

Scientific American. Readings in the Earth Science. 14th ed. W H Freeman, 1969.

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