editor-in-chief, Larry W. Mays
McGraw-Hill, 2000
Buku Referensi
The American Water Works Association, Inc.
McGraw-Hill, 1971
Buku Referensi
Larry W. Mays, editor in chief
McGraw-Hill, 1996
Buku Referensi
Alley, E. Roberts
Mcgraw-Hill, 2000
Buku Referensi
compiled by Michael and Irene Ash
Gower, 1996
Buku Referensi