APA (7th ed.) Citation

United Nations Environment Programme, Middleton, N., & Thomas, D. S. G. (1997). World atlas of desertification (2nd ed.). Arnold.

Chicago Style (17th ed.) Citation

United Nations Environment Programme, Nick Middleton, and David S. G. Thomas. World Atlas of Desertification. 2nd ed. London: Arnold, 1997.

MLA (9th ed.) Citation

United Nations Environment Programme, et al. World Atlas of Desertification. 2nd ed. Arnold, 1997.