Cita APA (7a ed.)

Olafson, F. A., & Evans, C. L. (1973). Ethics and twentieth century thought (First edition.). Prentice-Hall.

Cita Chicago Style (17a ed.)

Olafson, Frederick A., y Carolyn L. Evans. Ethics and Twentieth Century Thought. First edition. Englewood Cliffs, N.J.: Prentice-Hall, 1973.

Cita MLA (9a ed.)

Olafson, Frederick A., y Carolyn L. Evans. Ethics and Twentieth Century Thought. First edition. Prentice-Hall, 1973.