Chicago:
Albert Bigelow Paine, "Volume I, Part 1: 1835-1866," Mark Twain, a Biography, ed. Hawthorne, Julian, 1846-1934 in Mark Twain, a Biography (New York: Sir Isaac Pitman and Sons, 1894), Original Sources, accessed July 1, 2025, http://www.originalsources.com/Document.aspx?DocID=84SR4N1CAIV6275.
MLA:
Paine, Albert Bigelow. "Volume I, Part 1: 1835-1866." Mark Twain, a Biography, edited by Hawthorne, Julian, 1846-1934, in Mark Twain, a Biography, Vol. 22, New York, Sir Isaac Pitman and Sons, 1894, Original Sources. 1 Jul. 2025. http://www.originalsources.com/Document.aspx?DocID=84SR4N1CAIV6275.
Harvard:
Paine, AB, 'Volume I, Part 1: 1835-1866' in Mark Twain, a Biography, ed. . cited in 1894, Mark Twain, a Biography, Sir Isaac Pitman and Sons, New York. Original Sources, retrieved 1 July 2025, from http://www.originalsources.com/Document.aspx?DocID=84SR4N1CAIV6275.