APA

Ellms J. W., . (1917). Water purification. New York: McGraw-Hill.

Chicago

Ellms Joseph W, . 1917. Water purification. New York: McGraw-Hill.

Harvard

Ellms J. W., . (1917). Water purification. New York: McGraw-Hill.

MLA

Ellms Joseph W, . Water purification. New York: McGraw-Hill. 1917.