APA (7th ed.) Citation

Calkins, M. W. (1925). The persistent problems of philosophy: An introduction to metaphysics through the study of modern systems (5. rev. ed.). Macmillan.

Chicago Style (17th ed.) Citation

Calkins, Mary Whiton. The Persistent Problems of Philosophy: An Introduction to Metaphysics Through the Study of Modern Systems. 5. rev. ed. New York: Macmillan, 1925.

MLA (9th ed.) Citation

Calkins, Mary Whiton. The Persistent Problems of Philosophy: An Introduction to Metaphysics Through the Study of Modern Systems. 5. rev. ed. Macmillan, 1925.