Dyfyniad APA

Field, G. B., Verschuur, G. L., & Ponnamperuma, C. (1978). Cosmic evolution: An introduction to astronomy. Houghton Mifflin.

Dyfyniad Arddull Chicago

Field, George B., Gerrit L. Verschuur, and Cyrill Ponnamperuma. Cosmic Evolution: An Introduction to Astronomy. Boston: Houghton Mifflin, 1978.

Dyfyniad MLA

Field, George B., et al. Cosmic Evolution: An Introduction to Astronomy. Houghton Mifflin, 1978.

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