Não informado. (1988). Nordic Journal of Freshwater Research. Institute of Freshwater Research.
Chicago-Zitierstil (17. Ausg.)Não informado. Nordic Journal of Freshwater Research. Drottningholm, Suecia: Institute of Freshwater Research, 1988.
MLA-Zitierstil (8. Ausg.)Não informado. Nordic Journal of Freshwater Research. Institute of Freshwater Research, 1988.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.