Contents: Introduction chapter I mark Twain life and career

^a b "Samuel Clemens". PBS:The West. Retrieved August 25, 2007.

Gunderman, Richard (February 12, 2018). "Mark Twain's adventures in love: How a rough-edged aspiring author courted a beautiful heiress". The Conversation. Retrieved February 12, 2018.

Mark Twain; Edgar Marquess Branch; Michael B. Frank; Kenneth M. Sanderson (1990). Mark Twain's Letters: 1867–1868. University of California Press. ISBN 978-0520906075.

Jump up to:^a b c "David Gray biography". Mark Twain Project. Retrieved December 18, 2020.

"Concerning Mark Twain". The Week: A Canadian Journal of Politics, Literature, Science and Arts. 1 (11): 171. February 14, 1884. Retrieved April 26, 2013.