Dyfyniad APA

Simmons, G. (2007). Billions of missing links. Harvest House Publishers.

Dyfyniad Arddull Chicago

Simmons, Geoffrey. Billions of Missing Links. Eugene, OR: Harvest House Publishers, 2007.

Dyfyniad MLA

Simmons, Geoffrey. Billions of Missing Links. Harvest House Publishers, 2007.

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