«Necrològica».The New York Times. Arxivat de l'original el 2010-03-26[Consulta: 27 desembre 2009].«That Samuel L. Clemens was the greatest American humorist of his age nobody will deny»
Philip S. Foner, Mark Twain: Social Critic (Nova York: International Publishers, 1958), pàg. 13, citat a "The Mark Twain they didn't teach us about in school" (2000) de Helen Scott a la International Socialist Review 10, Hivern de 2000, p. 61–65
Scott, Helen. International Socialist Review. 10,Hivern 2000,p.61–65.«El Mark Twain que no ens van ensenyar a l'escola» (en anglès)
Frederick Anderson, ed., A Pen Warmed Up in Hell: Mark Twain in Protest (Nova York: Harper, 1972) pàg 8, citat a "The Mark Twain they didn't teach us about in school" de Helen Scott (2000) a International Socialist Review 10, Hivern 2000, pàgines 61–65
Frederick Anderson, ed., A Pen Warmed Up in Hell: Mark Twain in Protest (Nova York: Harper, 1972) pàg 9, citat a "The Mark Twain they didn't teach us about in school" de Helen Scott (2000) a International Socialist Review 10, Hivern 2000, pàgines 61–65
Maxwell Geismar, ed., Mark Twain and the Three Rs: Race, Religion, Revolution and Related Matters (Indianapolis: Bobs-Merrill, 1973), pàg.169, citat a "The Mark Twain they didn't teach us about in school" de Helen Scott (2000) a International Socialist Review 10, Hivern 2000, pàgines 61–65
Philip S. Foner, Mark Twain: Social Critic (Nova York: International Publishers, 1958), pàg. 200, citat a "The Mark Twain they didn't teach us about in school" (2000) de Helen Scott a la International Socialist Review 10, Hivern de 2000, p. 61–65
Twain, Mark.«Little Bessie». A:John S. Tuckey (ed.), Kenneth M. Sanderson (ed.), Bernard L. Stein (ed.), Frederick Anderson (ed.). Mark Twain's Fables of Man. California:University of California Press,1972. ISBN 978-0520020399.
Twain, Mark. Fenimore Cooper’s Literary Offenses. De Collected Tales, Sketches, Speeches and Essays, from 1891–1910. Editat per Louis J. Budd. New York: Library of America, 1992.
«Necrològica».The New York Times. Arxivat de l'original el 2010-03-26[Consulta: 27 desembre 2009].«That Samuel L. Clemens was the greatest American humorist of his age nobody will deny»