APA (7th ed.) Citation

Spencer, H. (1867). First principles (2nd ed.). Williams and Norgate.

Chicago Style (17th ed.) Citation

Spencer, Herbert. First Principles. 2nd ed. London: Williams and Norgate, 1867.

MLA (9th ed.) Citation

Spencer, Herbert. First Principles. 2nd ed. Williams and Norgate, 1867.

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