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