Calkins, M. W. (1915). The persistent problems of philosophy: An introduction to metaphysics through the study of modern systems. The Macmillan company; Macmillan & co., ltd..
Chicago Style (17th ed.) CitationCalkins, Mary Whiton. The Persistent Problems of Philosophy: An Introduction to Metaphysics Through the Study of Modern Systems. New York : London: The Macmillan company; Macmillan & co., ltd., 1915.
MLA (9th ed.) CitationCalkins, Mary Whiton. The Persistent Problems of Philosophy: An Introduction to Metaphysics Through the Study of Modern Systems. The Macmillan company; Macmillan & co., ltd., 1915.
Warning: These citations may not always be 100% accurate.