Não informado. (1970). Nordic Hydrology. Nordic Association for Hydrology.
Chicagoスタイル(17版)引用形式Não informado. Nordic Hydrology. Kobenhavn: Nordic Association for Hydrology, 1970.
MLA(8版)引用形式Não informado. Nordic Hydrology. Nordic Association for Hydrology, 1970.
警告: この引用は必ずしも正確ではありません.