Shanks, Jeffrey
The Dark Man: The Journal of Robert E. Howard Studies 7(2): 95-108, December 2014.
The Dark Man: The Journal of Robert E. Howard Studies 6 (1/2): 53-90. 2011.
Tompkins, Steven
The Dark Man No. 6: 54-57. Summer 2001.
Staib, John E.
Amra 2(65): 5-9. 1976.
Howard, Robert E.
in: Szumskyj, Ben, ed. Robert E. Howard: The Power of the Writing Mind. Poplar Bluff, MO: Mythos Books, 2003. p. 27-32.
de Camp, L. Sprague
in: de Camp, L. Sprague. Rubber Dinosaurs and Wooden Elephants: Essays on Literature, Film, and History. San Bernardino, CA: Borgo Press, 1996. pp.22-30.
Rickard, Dennis
in: Herron, Don, ed. Dark Barbarian: The Writings of Robert E. Howard, a Critical Anthology. Westport, CT: Greenwood, 1984. pp. 65-99.
Burke, Rusty
The Dark Man: The Journal of Robert E. Howard Studies No. 1: 17-22. August 1990.
Romeo, Gary
The Dark Man 5: 18-21. Winter 2001. 
Also, Online Resource, Robert E. Howard United Press Association. [3 p.] http://www.rehupa.com/romeo_elephant.htm
Louinet, Patrice
Ph. D. Dissertation, Sorbonne université, 2019.
Hall, Mark E.
The Dark Man: The Journal of Robert E. Howard Studies 8(1): 4-5. December 2015.
Connors, Scott
in: Herron, Don, ed. The Barbaric Triumph: A Critical Anthology on the Writings of Robert E. Howard. Rockville, MD: Wildside Press, 2004. p. 95-110.
Taylor, Keith
REH: Two-Gun Raconteur No. 5: 19-20. Winter 2003.
Szumskyj, Benjamin
New York: Hippocampus, 2006. 233 p.
Finn, Mark
in: Pelan, John and Walters, Jerard, eds. Conversations with the Weird Tales Circle. Lake Wood, CO: Centipede Press, 2009. p. 114-127.
Warfield, Wayne
Aberdeen, Maryland: Hall, 1976. 32pp.
de Camp, Catherine Crook
Niekas No. 31: 26-28. September 1983.
Mottern, Ron
International Journal of Reality Therapy 29(1): 54-59. Fall 2009.
Murphy, Brian
REH: Two-Gun Raconteur No. 14: 32-37. Summer 2010.
McHaney, Dennis
Mesmeridian 2:2-7. Summer 1973.
McCollum, Rick
Sword and Sorcery No. 6: 5-30. April 2006. (Reprinted from REHupa No. 175.)
Sword and Sorcery No. 7: 14-30. April 2006. (Reprinted from REHupa No. 178.)
Herron, Don
Firsts: The Book Collector's Magazine 16(3): 30-35. March 2006.
Van Hise, James
in: Van Hise, James, ed. The Fantastic Worlds of Robert E. Howard. Yucca Valley, CA: James Van Hise, 1997. pp.17-21.
Finn, Mark; Shanks, Jeffrey
in: Miller, Cynthia J. and van Riper, Bowdoin, eds. Undead in the West II: They Just Keep Coming, ed. by Cynthia J. Miller and Bowdoin van Riper. Lanham, PA: Scarecrow, 2013. p. 3-25.
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