Porter, Lindsay
Porter Publishing, 1995
Buku Referensi
Porter, Lindsay
Haynes Publishing, 1991
Buku Referensi
Escoe, A. Keith
Elsevier, 2008
Buku Teks
the Subcommitte in Operation of Wastewater Treatment Plants
Water Pollution Control Federation, 1976
Buku Referensi
Farnell, Warren M.
Pearson-Prentice Hall, 2006
Buku Teks