খবরিং, ঈ. ও. (1968). Philosophic Inquiry: An Introduction to Philosophy. Prentice-Hall.
Cita Chicago (17th ed.)খবরিং, ঈষধৎবহপব ওৎারহম. Philosophic Inquiry: An Introduction to Philosophy. Englewood Cliffs, N.J.: Prentice-Hall, 1968.
Cita MLA (9th ed.)খবরিং, ঈষধৎবহপব ওৎারহম. Philosophic Inquiry: An Introduction to Philosophy. Prentice-Hall, 1968.
Atenció: Aquestes cites poden no estar 100% correctes.