APA (7th ed.) Citation

Gibbs, W. J. (1987). A drought watch system. World Meteorological Organization.

Chicago Style (17th ed.) Citation

Gibbs, W. J. A Drought Watch System. [Geneva]: World Meteorological Organization, 1987.

MLA (9th ed.) Citation

Gibbs, W. J. A Drought Watch System. World Meteorological Organization, 1987.