Gaya APA

Pontius, F, W. (1990). water quality and treatment; a handbook of community water supplies (4). new york: Mc Graw-Hill.

Gaya MLA

Pontius, Frederick, W.. "water quality and treatment; a handbook of community water supplies". 4 new york: Mc Graw-Hill, 1990. Kesehatan Masyarakat.