1. Ognev, S.I., Zveri SSSR i prilezhashchikh stran: gryzuny (Animals of the Soviet Union and Neighboring Countries: Rodents), Moscow: Akad. Nauk SSSR, 1948, vol. 5.
2. Pavlinov, I.Ya. and Khlyap, L.A., Order Rodentia, in Mlekopitayushchie Rossii: sistematiko-geograficheskii spravochnik (Mammals of Russia: A Taxonomy-Geographical Reference Book), Pavlinov, I.Ya. and Lisovskii, A.A., Eds., Moscow: KMK, 2012, no. 52, pp. 142—312.
3. Ermakov, O.A., Titov, A.F., Surin, S.V., et al., A molecular genetic study of hybridization in four species of ground squirrels (Spermophilus: Rodentia, Sciuridae), Russ. J. Genet., 2002, vol. 38, no. 7, pp. 796—809. https://doi.org/10.1023/A:1016395722664
4. Titov, S.V., Ermakov, O.A., Surin, V.L., et al., Molecular genetic analysis of maternal and paternal lines during hybridization of ground squirrels (Spermophilus: Rodentia, Sciuridae), Byull. Mosk. O-va Ispyt. Prir.,
Otd. Biol., 2006, vol. 111, no. 5, pp. 30—35.
5. Titov, S.V., Ermakov, O.A., and Surin, V.L., Molecular, genetic, and bioacoustic diagnostics of russet (Spermophilus major Pallas, 1778) and yellow (S. fulvus Lichtenstein, 1823) ground squirrels from a joint settlement, Byull. Mosk. O-va Ispyt. Prir.,
Otd. Biol., 2005, vol. 110, no. 4, pp. 72—77.