APA (7th ed.) Citation

Unesco, International Hydrological Decade, & Unesco. (1972). Teaching aids in hydrology. Unesco.

Chicago Style (17th ed.) Citation

Unesco, International Hydrological Decade, and Unesco. Teaching Aids in Hydrology. Paris: Unesco, 1972.

MLA (9th ed.) Citation

Unesco, et al. Teaching Aids in Hydrology. Unesco, 1972.