Grant, Douglas
Mark Twain
Grove Press, 1962
 Buku Teks
Start-Up control using DC power supply for isolated mode operation of 100 kw wind power plant
 Artikel Jurnal
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
Cable, George Washington, 1844-1925
Mark Twain [and] G. W. Cable; the record of a literary friendship
Michigan State University Press, 1960
 Buku Teks