Nemzeti park a Kiskunságban
1979
Károly, Tóth |
Breeding
Prairie ducks : a study of their behavior, ecology and management
1955
Sowls, Lyle K. |
Ducks, geese and swans of North America
1978
Bellrose, Frank C. |
Kortright, Francis H. |
Waders breeding on wet grasslands
1991
Hötker, Hermann |
Atlas of breeding birds of the west Midlands : based on a field survey covering the counties of Warwickshire, Worcestershire and Staffordshire during the years 1966-1968
1970
Lord, J. |
Munns, D. J. |
Breeding success of three species of egret in the inner Niger delta, Mali
1986
Wallace, Jonathan |
Skinner, Jamie |
Altenburg, Wibe |
Fofana, Bouba |