APA (7th ed.) Citation

Unesco. (1974). Historical development of hydrological activities in the world. Unesco.

Chicago Style (17th ed.) Citation

Unesco. Historical Development of Hydrological Activities in the World. Paris, France: Unesco, 1974.

MLA (8th ed.) Citation

Unesco. Historical Development of Hydrological Activities in the World. Unesco, 1974.

Warning: These citations may not always be 100% accurate.