Lua APA (7ú heag.)

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

Lua i Stíl Chicago (17ú heag.)

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

Lua MLA (8ú heag.)

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

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.