GeoNative - Selkup: Selkup placenames, from the GeoNative website.
Selkups: Profile of the Selkup people, from NUPI - Centre for Russian Studies.
Selkups or Ostyak Samoyeds: Information from the Endangered Uralic Peoples site.
The Selkups: Overview article from The Red Book of the Peoples of the Russian Empire.