American Water Works Association, Raymond D. Letterman, technical editor
McGraw-Hill, 1999
Buku Referensi
The American Water Works Association, Inc.
McGraw-Hill, 1971
Buku Referensi
Alley, E. Roberts
Mcgraw-Hill, 2000
Buku Referensi
James K. Edzwald, editor
McGraw-Hill, 2011
Buku Teks
World Health Organization, 1985
Buku Teks