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The principles of psychology /
by Herbert Spencer.

APA Citation

Spencer, H. (1896). The principles of psychology. Authorized ed. New York: D. Appleton and company.

MLA Citation

Spencer, Herbert, 1820-1903. The Principles of Psychology. Authorized ed. New York: D. Appleton and company, 1896.

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