APA
WHO, . (1987). Technology for water supply and sanitation in developing countries: report of a who study group. Geneva: WHO Regional Publications.
Chicago
WHO, . 1987. Technology for water supply and sanitation in developing countries: report of a who study group. Geneva: WHO Regional Publications.
Harvard
WHO, . (1987). Technology for water supply and sanitation in developing countries: report of a who study group. Geneva: WHO Regional Publications.
MLA
WHO, . Technology for water supply and sanitation in developing countries: report of a who study group. Geneva: WHO Regional Publications. 1987.