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The principles of psychology /
by Herbert Spencer.

APA Citation

Spencer, H. (1886). The principles of psychology. Westminster edition. New York: D. Appleton and Company.

MLA Citation

Spencer, Herbert, 1820-1903. The Principles of Psychology. Westminster edition. New York: D. Appleton and Company, 1886.

Warning: These citations may not always be complete (especially for serials).