Dyfyniad APA

Whitehead, A. N., & Russell, B. (1935). Principia mathematica. London: Cambridge University press.

Dyfyniad Arddull Chicago

Whitehead, Alfred North., và Bertrand Russell. Principia Mathematica. London: Cambridge University press, 1935.

Dyfyniad MLA

Whitehead, Alfred North., và Bertrand Russell. Principia Mathematica. London: Cambridge University press, 1935.

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