Dyfyniad APA

Fraknoi, A., Morrison, D., & Wolff, S. (2004). Voyages through the universe (3rd ed.). Thomson.

Dyfyniad Arddull Chicago

Fraknoi, Andrew, David Morrison, and Sidney Wolff. Voyages Through the Universe. 3rd ed. Belmont, CA: Thomson, 2004.

Dyfyniad MLA

Fraknoi, Andrew, et al. Voyages Through the Universe. 3rd ed. Thomson, 2004.

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