APA Style
Krishnan, E, R. et al (1993).
Recovery of metals from sludges and wastewaters .
Park Ridge, N.J.:
Noyes Data Corporation.
MLA Style
Krishnan, E., Radha. et al.
"Recovery of metals from sludges and wastewaters".
Park Ridge, N.J.:
Noyes Data Corporation,
1993.
Buku.