Spellman, Frank R.
CRC Press, 2009
Buku Referensi
Casey , T. J.
John Wiley & Sons, 1996
Buku Teks
Royal Society of chemistry, 2000
Buku Teks
Published for the Water Research Centre, Stevenage Laboratory by Horwood , 1981
Buku Teks
by Metcalf & Eddy; Revised by George Tchobanoglous, Franklin L. Burton, H David Stensel
McGraw-Hill, 2003
Buku Teks