APA (7th ed.) Citation

Whitehead, A. N., & Russell, B. (1973). Principia mathematics to *56 (Repr.). Cambridge Univ. Pr.

Chicago Style (17th ed.) Citation

Whitehead, Alfred North, and Bertrand Russell. Principia Mathematics to *56. Repr. Cambridge: Cambridge Univ. Pr, 1973.

MLA (9th ed.) Citation

Whitehead, Alfred North, and Bertrand Russell. Principia Mathematics to *56. Repr. Cambridge Univ. Pr, 1973.

Warning: These citations may not always be 100% accurate.