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 July 2, 2025, http://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. 2 Jul. 2025. http://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 2 July 2025, from http://originalsources.com/Document.aspx?DocID=5S9CL1ICXCUXTZD.