"The Adventure of the Orient Express" (Note: This novelette had been published as a stand-alone volume by Candlelight Press, NY, 1964 as a softcover with dustjacket).
Chalker, Jack L.; Mark Owings (1998). The Science-Fantasy Publishers: A Bibliographic History, 1923-1998. Westminster, MD and Baltimore: Mirage Press, Ltd. p. 845.
Joshi, S.T. (1999). Sixty Years of Arkham House: A History and Bibliography. Sauk City, WI: Arkham House. p. 183. ISBN0-87054-176-5.
Nielsen, Leon (2004). Arkham House Books: A Collector's Guide. Jefferson, NC and London: McFarland & Company, Inc. p. 154. ISBN0-7864-1785-4.