Dyfyniad APA

Cooley, W. F. (1912). The principles of science: A college text-book. Henry Holt.

Dyfyniad Arddull Chicago

Cooley, William F. The Principles of Science: A College Text-book. New York: Henry Holt, 1912.

Dyfyniad MLA

Cooley, William F. The Principles of Science: A College Text-book. Henry Holt, 1912.

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