APA (7th ed.) Citation

Purtill, R. L. (1976). Thinking about ethics. Prentice Hall.

Chicago Style (17th ed.) Citation

Purtill, Richard Lawrence. Thinking About Ethics. London: Prentice Hall, 1976.

MLA (9th ed.) Citation

Purtill, Richard Lawrence. Thinking About Ethics. Prentice Hall, 1976.