Bick, H. (1972). Ciliated protozoa: An illustrated guide to the species used as biological indicators in freshwater biology. World Health Organization.
Chicago-Zitierstil (17. Ausg.)Bick, Hartmut. Ciliated Protozoa: An Illustrated Guide to the Species Used as Biological Indicators in Freshwater Biology. Geneva: World Health Organization, 1972.
MLA-Zitierstil (9. Ausg.)Bick, Hartmut. Ciliated Protozoa: An Illustrated Guide to the Species Used as Biological Indicators in Freshwater Biology. World Health Organization, 1972.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.