Dyfyniad APA

Russell, B. (1992). The Principles of mathematics (2nd ed.). Routledge.

Dyfyniad Arddull Chicago

Russell, Bertrand. The Principles of Mathematics. 2nd ed. London: Routledge, 1992.

Dyfyniad MLA

Russell, Bertrand. The Principles of Mathematics. 2nd ed. Routledge, 1992.

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