Dyfyniad APA

Abell, G. (1969). Exploration of the Universe. New York: Holt, Rinehart and Winston.

Dyfyniad Arddull Chicago

Abell, George. Exploration of the Universe. New York: Holt, Rinehart and Winston, 1969.

Dyfyniad MLA

Abell, George. Exploration of the Universe. New York: Holt, Rinehart and Winston, 1969.

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