1. Ankney C. D., 1977. Feeding and digestive organ size in breeding Lesser Snow Geese. Auk 94, 275–282.
2. Carss D. N., Marquiss M., 1997. The diet of Cormorants Phalacrocorax carbo in scottish freshwaters in relation to feeding habitats and fisheries. Ekologia Polska 45, 207–222.
3. De Nie H., 1995. Changes In the inland fuish populations in Europe in relation to the increase of the cormorant Phalacrocorax carbo sinensis. Ardea 83, 115–122.
4. Dunn E. H., 1975. Growth, body components and energy content of nestling double-crested cormorants. Condor 77, 431–438.
5. Działa-Szczepańczyk E., 2004. Morphometric charakteristic of oesophagus and intestine in blach scoter, Melanitta nigra (Anseriformes), wintering in the polish Baltic coast. Vest. Zool. 38 (4), 31–37.
6. Dzubin A., Cooch E., 1992. Measurement of Geese: General Field Methods, California Waterfowl Association. Sacramento. C A. 20.
7. Gille U., Salomon F.-V., Rönnert J., 1999. Growth of the digestive organs in ducks with considerations on their growth in birds in general. British Poultry Science 40(2): 194-202.
8. Grémillet D., Schmid D., Culik B., 1995. Energy requirements of breeding great cormorants Phalacrocorax carbo sinensis. Mar Ecol Prog Ser 121, 1–9.
9. Grémillet D., Rickmer D., Wanless S., Harris M. P., Regel J.,1996. Determining food intake by Great Cormiorant and European Shags with electronic balances. J. Field Ornithol. 67(4), 637–648.
10. Gwiazda R., 2004. Fish in the diet of the Cormorant and Yellow – legged Gull breeding near fish ponds (upper Vistula river valley, southern Poland) – preliminary study. Acta Zoologia Cracoviensia. 47, 17–26.
11. Gwiazda R., 2006. Foraging strategies of fish-eating birds in conditions of artificial reservoirs in southern Poland. Studia Naturae 51, PAN Kraków.
12. Hoyo J. del, Elliot A., Sargatal J., 1992. Handbook of the birds of the world. Vol.1 Lynx Editio, Barcelona.
13. Kato A., Nishiumi I., Naito Y., 1996. Sexual differences in the diet of king cormorants at Macquarie Island. Polar Biol 16, 75–77.
14. Keller T., 1995. Food of cormorants Phalacrocorax carbo sinensis wintening in Bavaria, Southern Germany. Ardea 83 (1), 185–192.
15. Koffijberg K., Van Eerden M. R., 1995. Sexual dimorphism in the Cormorant Phalacrocorax carbo sinensis: possible implications for differences in structural size. Ardea 83(1), 37–46.
16. Leopold A. S., 1953. Intestinal morphology of gallinaceous birds in relation to food habits. J. Wildl. Manage. 17 (2), 197–203.
17. Liordos V., Goutner V., 2009. Sexual differences in diet of great cormorants Phalacrocorax carbo sinensis wintering in Greece. Eur J Wildl Res 55, 301–308.
18. Madsen, F.J., Spärck R., 1950. On the feeding habits of the Southern Cormorant in Denmark. Dan. Rev. Game. Biol. Vol. I. Part 3, 45–70.
19. Martucci O., 1997. Winter food habits of cormorants Phalacrocorax carbo in central Italy: same remarks. Ekologia Polska 45(1), 239–243.
20. McLelland, J., 1979. Digestive system. In Form and Function in Birds. A.S. King and J. McLelland, eds. Academic Press, London and New York, Vol. 1.
21. Opačak A., Florijančić T., Horvat D., Ozimec S., Bodakos D., 2004. Diet spectrum of gereat cormorant (Phalacrocorax carbo sinensis L.) at the Donji Miholjac carp fishponds in eastern Croatia. Eur J Wildl Res 50, 173–178.
22. Pendergast B. A., Boag D. A., 1973. Seasonal changes in the internall anatomy of Spruce grouse in Alberta. Auk 90, 307–317.
23. Pulliainen E., 1976. Small intestine and caeca lenghts in the willow grouse (Lagopus lagopus) in Finnish Lapland. Ann. Zool. Fennici 13, 195–199.
24. Santoul F., Hougas J-B., Green A.J., Mastrorillo S., 2004. Diet of great cormorants Phalacrocorax carbo sinensis wintering in Malause (South-West France). Arch. Hydrobiol. 160(2), 281–287.
25. Suter W., 1997. Roach rules: Shoaling fish are a constant factor in the diet of Cormorants Phalacrocorax carbo in Switzerland. Ardea 85, 9–27.
26. Szczepańczyk E., Kalisińska E., Ligocki M., Bartyzel B., 1999. Morphometry of gut in the White – fronted Goose Anser albifrons. Adv. Agr. Scien. 6, 79–90.
27. Szczepańczyk E., Kalisińska E., Ligocki M., Bartyzel B., 2000. Morphometry of esophagus and gut in bean goose Anser fabalis. Zool. Pol. 45, 37–49.
28. Van Dobben W. H., 1995. The food of the cormorant Phalacrocorax carbo sinensis: old and new research compared. Ardea 83, 139–142.
29. Van Eerden M. R., Voslamber B., 1995. Mass fishing by cormorants Phalacrocorax carbo sinensis at lake Ijsselmeer, the Netherlands: arecent and successful adaptation to a turbid environment. Ardea 83, 199–212.