Chicago: Mark Twain, "Preface," Sketches New and Old, trans. Hapgood, Isabel Florence, 1850-1928 in Sketches New and Old (London: Effingham Wilson, Royal Exchange, 1920), Original Sources, accessed May 3, 2025, http://www.originalsources.com/Document.aspx?DocID=5S9CL1ICXCUXTZD.
MLA: Twain, Mark. "Preface." Sketches New and Old, translted by Hapgood, Isabel Florence, 1850-1928, in Sketches New and Old, London, Effingham Wilson, Royal Exchange, 1920, Original Sources. 3 May. 2025. http://www.originalsources.com/Document.aspx?DocID=5S9CL1ICXCUXTZD.
Harvard: Twain, M, 'Preface' in Sketches New and Old, trans. . cited in 1920, Sketches New and Old, Effingham Wilson, Royal Exchange, London. Original Sources, retrieved 3 May 2025, from http://www.originalsources.com/Document.aspx?DocID=5S9CL1ICXCUXTZD.