APA (7th ed.) Citation

Macnaughton, W. R. (1979). Mark Twain's last years as a writer. University of Missouri Press.

Chicago Style (17th ed.) Citation

Macnaughton, William R. Mark Twain's Last Years as a Writer. Columbia: University of Missouri Press, 1979.

MLA (9th ed.) Citation

Macnaughton, William R. Mark Twain's Last Years as a Writer. University of Missouri Press, 1979.