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3. Kretchmar A.V., Andreev A.V., Kondratyev A.Ya. 1991. Birds of Northern Plains. Leningrad. Naukaµ Publ.house Leningrad branch, 288 p.

4. Pearce, J.M., P.J. Heglund, J.Hupp, M.R.Peterson (1994): The Spectacled Eider on the Indigirka River Delta, Sakha, Russia. IWRB-TWRG Newsletter No. 5: 10-11.

5. Stehn, R.A. (1994): Decline of Spectacled Eiders nesting in Western Alaska. IWRB-TWRG Newsletter 5: 9-10

7. Stehn, R.A., C. P. Dau, B. Conant, W.I.Butler (1993):Decline of Spectacled Eiders nesting in Western Alaska. Wildfowl 46:246-277.