Polish Entomological Society - Polskie Towarzystwo Entomologiczne http://www.au.poznan.pl/wydzialy/ogrodniczy/ pte/index.html

Sphingidae of the Western Palearctic by A.R. Pittaway
http://tpittaway.tripod.com/sphinx/list.htm

The butterflies of Europe by Paolo Mazzei
http://web.tiscalinet.it/leps/

Sphingidae North America by W. Oehlke
http://www3.pei.sympatico.ca/linda.bryson/indexsp.htm

Systematyka Sphingidae by Markku Savela
http://www.funet.fi/pub/sci/bio/life/insecta/lepidoptera/ditrysia/sphingoidea/
sphingidae/index.html

Insect of the former Soviet Union by Dmitriy Sobanin

Moths of USA - Sphingidae by USGS
http://www.npwrc.usgs.gov/resource/distr/lepid/moths/usa/sphingid.htm

Honk-Kong Sphingidae Photo Gallery by R.C. Kendrick
http://web.hku.hk/~kendrick/sph/hksphi.htm

Colour Atlas of the Siberian Lepidoptera by Eduard Berlov
http://www.geocities.com/siberianlepidoptera