APA (7th ed.) Citation

Haspelmath, M., Dryer, M. S., Gil, D., & Comrie, B. (2005). The World Atlas of Language Structures.

Chicago Style (17th ed.) Citation

Haspelmath, Martin, Matthew S. Dryer, David Gil, and Bernard Comrie. The World Atlas of Language Structures. 2005.

MLA (9th ed.) Citation

Haspelmath, Martin, et al. The World Atlas of Language Structures. 2005.