APA (7th ed.) Citation

Henning, D., Flohn, H., United Nations Environment Programme, & United Nations Conference on Desertification. (1977). Climate aridity index (Budyko-Ratio). UNEP.

Chicago Style (17th ed.) Citation

Henning, D., Hermann Flohn, United Nations Environment Programme, and United Nations Conference on Desertification. Climate Aridity Index (Budyko-Ratio). Nairobi: UNEP, 1977.

MLA (8th ed.) Citation

Henning, D., et al. Climate Aridity Index (Budyko-Ratio). UNEP, 1977.