Não informado. (1970). Nordic Hydrology. Nordic Association for Hydrology.
Style de citation Chicago (17e éd.)Não informado. Nordic Hydrology. Kobenhavn: Nordic Association for Hydrology, 1970.
Style de citation MLA (8e éd.)Não informado. Nordic Hydrology. Nordic Association for Hydrology, 1970.
Attention : ces citations peuvent ne pas être correctes à 100%.