APA (7th ed.) Citation

Peter S Hill, Scott Brown, & Just Haffeld. (2011). Effective aid in a complex environment. The World Health Organization.

Chicago Style (17th ed.) Citation

Peter S Hill, Scott Brown, and Just Haffeld. Effective Aid in a Complex Environment. The World Health Organization, 2011.

MLA (9th ed.) Citation

Peter S Hill, et al. Effective Aid in a Complex Environment. The World Health Organization, 2011.

Warning: These citations may not always be 100% accurate.