Cita APA (7th ed.)

D Duncan, . M. (1984). The desing of ventilated improved pit latrines.

Cita Chicago (17th ed.)

D Duncan, Mara. The Desing of Ventilated Improved Pit Latrines. Washington, DC : Technology Advisory Group, World Bank, 1984.

Cita MLA (9th ed.)

D Duncan, Mara. The Desing of Ventilated Improved Pit Latrines. 1984.