Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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