OSIEJUK, Tomasz S. et al. The effect of water conditions on breeding bird communities of pastures, meadows and shrub habitats in the Sloňsk reserve, NW Poland. In Biologia. Section A. Section B. Section C, Botany. Zoology. Cellular and molecular biology. ISSN 0006-3088. ISSN 1335-6372. ISSN 1335-6380. ISSN 1335-6399, 1999, roč. 54, č. 2, s. 207-214.