APA (7th ed.) Citation

Spencer, H. (1904). First principles / by Herbert Spencer (6th ed.). Williams & Norgate.

Chicago Style (17th ed.) Citation

Spencer, Herbert. First Principles / by Herbert Spencer. 6th ed. London: Williams & Norgate, 1904.

MLA (9th ed.) Citation

Spencer, Herbert. First Principles / by Herbert Spencer. 6th ed. Williams & Norgate, 1904.

Warning: These citations may not always be 100% accurate.