Style de citation APA (7e éd.)

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

Style de citation Chicago (17e éd.)

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

Style de citation MLA (8e éd.)

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