APA (7th ed.) Citation

Masters, E. L. (1938). Mark Twain: A portrait. C. Scribner's Sons.

Chicago Style (17th ed.) Citation

Masters, Edgar Lee. Mark Twain: A Portrait. New York: C. Scribner's Sons, 1938.

MLA (8th ed.) Citation

Masters, Edgar Lee. Mark Twain: A Portrait. C. Scribner's Sons, 1938.

Warning: These citations may not always be 100% accurate.