Não informado. (1999). Bulletin of the Czech Geological Survey. Czech Geological Survey.
Chicago-Zitierstil (17. Ausg.)Não informado. Bulletin of the Czech Geological Survey. Praha: Czech Geological Survey, 1999.
MLA-Zitierstil (8. Ausg.)Não informado. Bulletin of the Czech Geological Survey. Czech Geological Survey, 1999.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.