Berg, Å. (1991). Ecology of curlews (Numenius arquata) and lapwings (Vanellus vanellus) on farmland. Swedish University of Agricultural Sciences, Dept. of Wildlife Ecology.
Chicago-referens (17:e uppl.)Berg, Åke. Ecology of Curlews (Numenius Arquata) and Lapwings (Vanellus Vanellus) on Farmland. Uppsala, Sweden: Swedish University of Agricultural Sciences, Dept. of Wildlife Ecology, 1991.
MLA-referens (8:e uppl.)Berg, Åke. Ecology of Curlews (Numenius Arquata) and Lapwings (Vanellus Vanellus) on Farmland. Swedish University of Agricultural Sciences, Dept. of Wildlife Ecology, 1991.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.