Bragin E.A. 1999. State of rare species of birds in Northern Turgai region and in Naurzum Reserve. Territorial aspects of birds protection in Central Asia and Kazakhstan. Moscow, P. 85-92. (in Russian)
Bragin E.A., and BraginaT.M. (2002) T.M. Wetlands in system of natural complexes of Northern Kazakhstan. General characteristic and nature-protection importance. The most important wetlands of Northern Kazakhstan (in limits of Kostanay and west part of North-Kazakhstan regions). Edited by Bragin E.A. and BraginaT.M.- Moscow: Russian University (series WWF, issue 5): 19-38. (in Russian)..
Bragin E.A., Kovshar A.F. (2002) T.M. Lakes Bolshoi and Malyi Sankebai. The most important wetlands of Northern Kazakhstan (in limits of Kostanay and west part of North-Kazakhstan regions). Edited by Bragin E.A. and BraginaT.M.- Moscow: Russian University (series WWF, issue 5): P. 123-127. (in Russian)..
Bragin E.A. (2004). Distribution and population numbers of swans in Kostanai Region in 1998-2002. Transactions of Institute of Zoology, V. 47. “Migrations of birds in Asia”, Almaty. P. 75-86. (in Russian)
Yerokhov S.N., Berezovikov N.N., Kellomyaki E.N., Ripatti N.L. (2000). Anser erythropus and concomitant species of geese on their migration in Kazakhstan. Brant # 6, Bulletin of the working group on geese and swans of Eastern Europe and Central Asia., M.,P.121-157. (in Russian)
Gvozdetsky N.A., Nikolayev V.A. (1971) Kazakhstan. – Moscow, Publ.House “Mysl’”, 294 p. (in Russian)
Filonets O.O., Omarov A.A. (1974) Lakes of Northern, Western and Eastern Kazakhstan. Reference-book, ”HydroMetIzdat” Publ. House, L. (in Russian)
J.Markkola, P.Pynnonen, P.Tolvanen, A.Veersaly & S.Yerohov. 1998. The second International Lesser White-fronted Geese Anser erythropus expedition in NW Kazakhstan in May 1997// WWF. Finland Report # 9. Finnish Lesser White-fronted Goose Conservation Project. Annual report, 1997. Helsinki, p. 21- 22.
P.Tolvanen & P.Pynnonen. 1998. Monitoring the autumn migration of Lesser White-fronted Geese Anser erythropus and other gees in NW Kazakhstan in October 1996// WWF. Finland Report # 9. Finnish Lesser White-fronted Goose Conservation Project. Annual report, 1997. Helsinki, p. 19- 20.