APA (7th ed.) Citation

Ryan, B. A., & Mara, D. D. (1983). Ventilated improved pit latrines: Vent pipe design guidelines. World Bank.

Chicago Style (17th ed.) Citation

Ryan, Beverly A., and D. Duncan Mara. Ventilated Improved Pit Latrines: Vent Pipe Design Guidelines. Washington, D. C: World Bank, 1983.

MLA (9th ed.) Citation

Ryan, Beverly A., and D. Duncan Mara. Ventilated Improved Pit Latrines: Vent Pipe Design Guidelines. World Bank, 1983.