Dyfyniad APA

Tyson, N. d., & Goldsmith, D. (2014). Origins: Fourteen billion years of cosmic evolution. W.W. Norton & Company.

Dyfyniad Arddull Chicago

Tyson, Neil deGrasse, and Donald Goldsmith. Origins: Fourteen Billion Years of Cosmic Evolution. New York: W.W. Norton & Company, 2014.

Dyfyniad MLA

Tyson, Neil deGrasse, and Donald Goldsmith. Origins: Fourteen Billion Years of Cosmic Evolution. W.W. Norton & Company, 2014.

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