Chicago: Mark Twain, "What Is Man?," What Is Man? and Other Essays Original Sources, accessed May 3, 2025, http://www.originalsources.com/Document.aspx?DocID=52W7B9JFTI7J2ZS.
MLA: Twain, Mark. "What Is Man?." What Is Man? and Other Essays, Original Sources. 3 May. 2025. http://www.originalsources.com/Document.aspx?DocID=52W7B9JFTI7J2ZS.
Harvard: Twain, M, 'What Is Man?' in What Is Man? and Other Essays. Original Sources, retrieved 3 May 2025, from http://www.originalsources.com/Document.aspx?DocID=52W7B9JFTI7J2ZS.