Cita APA (7a ed.)

Spencer, H. (1993). The Principles of Ethics: By Herbert Spencer. Williams and Norgate.

Cita Chicago Style (17a ed.)

Spencer, Herbert. The Principles of Ethics: By Herbert Spencer. London ; Edinburgh: Williams and Norgate, 1993.

Cita MLA (8a ed.)

Spencer, Herbert. The Principles of Ethics: By Herbert Spencer. Williams and Norgate, 1993.