Grant, Douglas
Mark Twain
Grove Press, 1962
 Buku Teks
Neider, Charles
The Autobigraphy of Mark Twain
NY. Harper & Brothers
 Buku Teks
Mark Twain letters to mary
edited with a commerntary by Lewis G. Leary
Columbia University Press, 1961
 Buku Teks
Smith, Henry Nash
Mark Twain: the development of a writer
Belknap Press of Harvard University Press, 1967
 Buku Teks
Twain, Mark, 1835-1910
Mark Twain in Australia and New Zealand
Penguin Books, 1973
 Buku Teks