G. O.  Krizek, ?Flying sphingid photos?, News of the Lepidopterists' Society, vol. 1989, no. 1, p. 5, 1989.

G. O.  Krizek, ?Sphingids in flight?, News of the Lepidopterists' Society, vol. 44, no. 2, p. 63, 69, 2002.