Não informado. (1999). Bulletin of the Czech Geological Survey. Czech Geological Survey.
Chicagoスタイル(17版)引用形式Não informado. Bulletin of the Czech Geological Survey. Praha: Czech Geological Survey, 1999.
MLA(8版)引用形式Não informado. Bulletin of the Czech Geological Survey. Czech Geological Survey, 1999.
警告: この引用は必ずしも正確ではありません.