APA (7. basım) Alıntı

Spencer, H. (1902). The principles of ethics. D. Appleton.

Chicago Style (17. basım) Atıf

Spencer, Herbert. The Principles of Ethics. New York: D. Appleton, 1902.

MLA (9th ed.) Atıf

Spencer, Herbert. The Principles of Ethics. D. Appleton, 1902.