Figaro [Clapp, Henry Jr.]. "Dramatic Feuilleton." New York Saturday Press. (1865-10-14).
WORKS ABOUT - Clapp, Henry
John. "Dramatic Feuilleton." New York Saturday Press. (1865-11-25).
Belphegor. "Dramatic Feuilleton." New York Saturday Press. (1865-12-12).
Ego. "Letter from Paris." New-York Saturday Press. (1866-3-10).
Ego. "Letter from Paris." New-York Saturday Press. (1866-3-31).
Ego. "Letter from Paris [from our own correspondent]." New-York Saturday Press. (1866-4-17).
Whitman, Walt. "Letter to John Burroughs." Letter to John Burroughs. (1867-9-21).
Browne, Junius Henri. The Great Metropolis; A Mirror of New York. Hartford: American Publishing. (1869-1-1).
"Literary News." The Literary World. (1873-5-11).
"Obituary: Henry Clapp." The New-York Times. (1875-4-11).
"Current Memoranda." Potter's American Monthly. (1875-9-1).
Clapp, Ebenezer. The Clapp Memorial: Record of the Clapp Family in America, Containing Sketches of the Original Six Emigrants and a Genealogy of their Descendants Bearing the Name. With a Supplement and the Proceedings at Two Family Meetings. Boston: David Clapp & Son. (1876-1-1).
Congdon, Charles T.. Reminiscences of a Journalist. Boston: James R. Osgood. (1880-1-1).
"Three New York Poets." Scribner's Monthly. (1881-7-1).
Haynes, John Edward. Pseudonyms of Authors: Including Anonyms and Initialisms. New York. (1882-1-1).
Walsh, William Shepard; Jay Charlton. Pen Pictures of Modern Authors. New York: G. P. Putnam. (1882-1-1).
Derby, J.C.. Fifty Years among Authors, Books and Publishers. New York: G. W. Carleton and Co. (1884-1-1).
G. J. M.. "Bohemianism: The American Authors Who Met in a Cellar." Brooklyn Eagle. (1884-5-25).
English, Thomas Dunn. "That Club at Pfaaf's [sic]." The Literary World. (1886-6-12).
"Old 'Barry Gray' Dead." The New York World. New York. (1886-6-12).