APA (7th ed.) Citation

Callahan, D., & Engelhardt, H. T., Jr. (1981). The Roots of ethics: Science, religion, and values. Plenum Press.

Chicago Style (17th ed.) Citation

Callahan, Daniel, and H. Tristram Engelhardt, Jr. The Roots of Ethics: Science, Religion, and Values. New York ; London: Plenum Press, 1981.

MLA (9th ed.) Citation

Callahan, Daniel, and H. Tristram Engelhardt, Jr. The Roots of Ethics: Science, Religion, and Values. Plenum Press, 1981.