APA استشهاد

Whitehead, A. N., & Russell, B. (1927). Principia mathematica. V. 1.- 2nd ed. University Press.

استشهاد بنمط شيكاغو

Whitehead, Alfred North, و Bertrand Russell. Principia Mathematica. V. 1.- 2nd Ed. Cambridge: University Press, 1927.

MLA استشهاد

Whitehead, Alfred North, و Bertrand Russell. Principia Mathematica. V. 1.- 2nd Ed. University Press, 1927.