1. Etnogenez i etnosfera;Gumilev;Priroda,1970
2. On the Anthropogenic Factor in Landscape Formation (Landscape and Ethnos VII)
3. All of the quotations in this paragraph are from Andersen (2010).
4. Etnos, istoriia, kul'tura;Gumilev;Dekorativnoe Iskusstvo SSSR,1989d
5. Samoorganizatsiia v prirode i etnogenez;Ermolaev;Izvestiia Vsesoiuznogo Geograficheskogo Obshchestva,1990