APA

Spellman F. ., .Water and Wast water Treament plant operation. New York :CRC press ,2013: .

Chicago

Spellman Frank, .Water and Wast water Treament plant operation. New York :CRC press ,2013: .

Harvard

Spellman F. ., .Water and Wast water Treament plant operation. New York :CRC press ,2013: .

MLA

Spellman Frank, .New York :CRC press ,2013: . .