Dyfyniad APA

Chrisholm, R. (1978). Principles of economics. Scott, Froeman and co..

Dyfyniad Arddull Chicago

Chrisholm, Roger. Principles of Economics. London: Scott, Froeman and co., 1978.

Dyfyniad MLA

Chrisholm, Roger. Principles of Economics. Scott, Froeman and co., 1978.

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