APA način citiranja (7. izdanje)

Spencer, H. (1891). The Principles of Ethics (2nd thousand.). Williams and Norgate.

Čikaški stil citiranja (17. izdanje)

Spencer, Herbert. The Principles of Ethics. 2nd thousand. London ; Edinburgh: Williams and Norgate, 1891.

MLA način citiranja (8. izdanje)

Spencer, Herbert. The Principles of Ethics. 2nd thousand. Williams and Norgate, 1891.