Gaya APA

Whittington, D. et al (1992). Household Demand for Improved Sanitation Services : A Case Study of Kumasi Ghana . Washington DC: UNDP-World Bank.

Gaya MLA

Whittington, Dale. et al. "Household Demand for Improved Sanitation Services : A Case Study of Kumasi Ghana". Washington DC: UNDP-World Bank, 1992. print.