Fassett, Norman C.
University of Wisconsin Press, 1985
Buku Referensi
Plowden, C. Chicheley
George Allen and Unwin, 1972
Buku Teks
the Subcommitte in Operation of Wastewater Treatment Plants
Water Pollution Control Federation, 1976
Buku Referensi
Kaufmann, Fred H.
Burgess Publishing, 1969
Buku Teks
Baron, Stephen L., editor
Prentice-Hall, 1978
Buku Referensi