Cita APA (7th ed.)

Frankena, W. K. (1973). Ethics (2nd ed.). Prentice-Hall.

Cita Chicago (17th ed.)

Frankena, William K. Ethics. 2nd ed. Englewood Cliffs, N.J.: Prentice-Hall, 1973.

Cita MLA (9th ed.)

Frankena, William K. Ethics. 2nd ed. Prentice-Hall, 1973.