Dyfyniad APA

Duncan, R., & Weston-smith, M. (1977). Encyclopaedia of ignorance: Everything you ever wanted to know about the unknown. Oxford.

Dyfyniad Arddull Chicago

Duncan, Ronald, and Miranda Weston-smith. Encyclopaedia of Ignorance: Everything You Ever Wanted to Know About the Unknown. Pergamon Press: Oxford, 1977.

Dyfyniad MLA

Duncan, Ronald, and Miranda Weston-smith. Encyclopaedia of Ignorance: Everything You Ever Wanted to Know About the Unknown. Oxford, 1977.

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