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First principles,
by Herbert Spencer.

APA Citation

Spencer, H. (1900). First principles: by Herbert Spencer. 6th ed. New York: D. Appleton and Company.

MLA Citation

Spencer, Herbert, 1820-1903. First Principles: by Herbert Spencer. 6th ed. New York: D. Appleton and Company, 1900.

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