APA (7th ed.) Citation

Spencer, H. (1900). First principles ((6th ed.).). D. Appleton and company.

Chicago Style (17th ed.) Citation

Spencer, Herbert. First Principles. (6th ed.). New York: D. Appleton and company, 1900.

MLA (9th ed.) Citation

Spencer, Herbert. First Principles. (6th ed.). D. Appleton and company, 1900.