APA (7th ed.) Citation

Unesco & World Meteorological Organization. (1977). Hydrological maps: A contribution to the International Hydrological Decade. UNESCO.

Chicago Style (17th ed.) Citation

Unesco and World Meteorological Organization. Hydrological Maps: A Contribution to the International Hydrological Decade. Paris: UNESCO, 1977.

MLA (9th ed.) Citation

Unesco and World Meteorological Organization. Hydrological Maps: A Contribution to the International Hydrological Decade. UNESCO, 1977.