Whitman, Walt. "Letter to Henry Clapp, Jr., June 12, 1860." Walt Whitman: The Correspondence. New York: New York University Press. (1961-1-1).
WORKS ABOUT - Clapp, Henry
Whitman, Walt. "Letter to William D. O'Connor, September 15, 1867." Walt Whitman: The Correspondance. New York: New York University Press. (1961-1-1).
Whitman, Walt. "Letter to William D. O'Connor, May 5, 1867." Walt Whitman: The Correspondence. New York: New York University Press. (1961-1-1).
Hahn, Emily. Romantic Rebels; An Informal History of Bohemianism in America. Boston; Houghton Mifflin. (1967-1-1).
Stovall, Floyd. The Foreground of Leaves of Grass. Charlottesville: University Press of Virginia. (1974-1-1).
Lalor, Eugene T.. "The Literary Bohemians of New York City in the Mid-Nineteenth Century." The Literary Bohemians of New York City in the Mid-Nineteenth Century. Ph.D. Dissertation, St. John's University. (1977-1-1).
Lalor, Eugene. "Whitman among the New York Literary Bohemians: 1859–1862." Walt Whitman Review. (1979-1-1). 131-145.
Miller, Tice L.. Bohemians and Critics: American Theatre Criticism in the Nineteenth Century. Metuchen, NJ: The Scarecrow Press. (1981-1-1).
Zweig, Paul. Walt Whitman: The Making of the Poet. New York: Basic Books, Inc., Publishers. (1984-1-1).
Erkkila, Betsy. Whitman the Political Poet. New York: Oxford University Press. (1989-1-1).
Hyman, Martin D.. "'Where the Drinkers & Laughers Meet': Pfaff's: Whitman's Literary Lair." Seaport. (1991-4-1). 56-61.
Stansell, Christine. "Whitman at Pfaff's: Commercial Culture, Literary Life and New York Bohemia at Mid-Century." Walt Whitman Quarterly Review. (1993-1-1). 107-126.
Guarneri, Carl J.. The Utopian Alternative: Fourierism in Nineteenth-Century America. Cornell, NY: Cornell University Press. (1994-1-1).
Reynolds, David S.. Walt Whitman's America: A Cultural Biography. New York: Knopf. (1995-1-1).
Renehan, Edward, Jr.. John Burroughs: An American Naturalist. New York: Black Dome Press. (1998-1-1).
Loving, Jerome. Walt Whitman: The Song of Himself. Berkley Calif. : University of California Press. (1999-1-1).
Morris, Roy Jr.. The Better Angel: Walt Whitman in the Civil War. Oxford: Oxford University Press. (2000-1-1).
Twain, Mark. The Autobiography of Mark Twain. New York: HarperCollins. (2000-1-1).
Traubel, Horace. Intimate with Walt: Selections from Whitman's Conversations with Horace Traubel, 1888-1892. Iowa City: University of Iowa Press. (2001-1-1).
Levin, Joanna Dale. "American Bohemias, 1858-1912: A Literary and Cultural Geography." American Bohemias, 1858-1912: A Literary and Cultural Geography. Ph.D Dissertation; Stanford University. (2001-1-1).