H. P. Lovecraft to Myrta Alice Little (17 May 1921); Lovecraft Studies No. 26 (Spring 1992): 28–29.
The Annotated Supernatural Horror in Literature, ed. S. T. Joshi (New York: Hippocampus Press, 2012), p. 53.
See Mel Gordon, The Grand Guignol: Theatre of Fear and Terror (New York: Amok Press, 1988); Richard J. Hand and Michael Wilson, Grand-Guignol: The French Theatre of Horror (Exeter, UK: University of Exeter Press, 2002). The latter volume contains new translations of Level’s Sous la lumière rouge (as In the Darkroom) and Le Baiser dans la nuit (as The Final Kiss).