Dyfyniad APA

Robbins, R. R., Jeffreys, W. H., & Shawl, S. J. (1995). Discovering astronomy (3rd ed.). Wiley.

Dyfyniad Arddull Chicago

Robbins, R. Robert, William H. Jeffreys, and Stephen J. Shawl. Discovering Astronomy. 3rd ed. New York: Wiley, 1995.

Dyfyniad MLA

Robbins, R. Robert, et al. Discovering Astronomy. 3rd ed. Wiley, 1995.

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