Sources
Burleson, Donald R. Lovecraft: Disturbing the Universe. Lexington, Kentucky: The University Press of Kentucky, 1990.
Cannon, Peter. H.P. Lovecraft. Boston: Twayne Publishers, 1989.
Lovecraft, Howard Phillips. “Supernatural Horror In Literature”. 1927, 1933-1935. Public Domain. 2 Apr. 2001.
Migliore, Andrew and John Strysik. The Lurker In the Lobby: A Guide to the Cinema of H.P. Lovecraft. Seattle: Armitage House, 2000.
Schultz, David E. and S.T. Joshi, eds. An Epicure In the Terrible: A Centennial Anthology of Essays In Honor of H.P. Lovecraft. London: Associated University Presses, 1991.
Shreffler, Philip A. The H.P. Lovecraft Companion. Westport, Connecticut: Greenwood Press, 1977.
The H.P. Lovecraft Archive
The Lurker In the Lobby: Excellent site exploring the vast world of Lovecraft adaptation; includes film, television, and unknown student films. Buy their book!
www.mtroyal.ab.ca/gaslight.superhor.htm: Here can be found the complete text of Lovecraft's essay "Supernatural Horror In Literature".