Cita APA (7th ed.)

Altaf, A., Jamal, H., & Whittington, D. (1992). Willingness to pay for water in rural Punjab, Pakistan. UNDP-World Bank Water and Sanitation Program, World Bank.

Cita Chicago (17th ed.)

Altaf, Anjum, Haroon Jamal, i Dale Whittington. Willingness to Pay for Water in Rural Punjab, Pakistan. Washington, D.C: UNDP-World Bank Water and Sanitation Program, World Bank, 1992.

Cita MLA (9th ed.)

Altaf, Anjum, et al. Willingness to Pay for Water in Rural Punjab, Pakistan. UNDP-World Bank Water and Sanitation Program, World Bank, 1992.