APA (7th ed.) Citation

Ward, J., & Campbell, O. W. (1968). Essays in philosophy. Books for Libraries Press.

Chicago Style (17th ed.) Citation

Ward, James, and Olwen Ward Campbell. Essays in Philosophy. Freeport, N.Y.: Books for Libraries Press, 1968.

MLA (9th ed.) Citation

Ward, James, and Olwen Ward Campbell. Essays in Philosophy. Books for Libraries Press, 1968.