Cita APA (7th ed.)

Ryan, B. A. (1983). Pit latrine ventilation: Field investigation methodology. IBRD/World Bank.

Cita Chicago (17th ed.)

Ryan, Beverley A. Pit Latrine Ventilation: Field Investigation Methodology. Washington, D.C: IBRD/World Bank, 1983.

Cita MLA (9th ed.)

Ryan, Beverley A. Pit Latrine Ventilation: Field Investigation Methodology. IBRD/World Bank, 1983.