APA
Punmia B.c, . (2011). Environmental Engineering -2 Wasterwater engineering. : Laxmi Publicatoin New Delhi.
Chicago
Punmia B.c, . 2011. Environmental Engineering -2 Wasterwater engineering. : Laxmi Publicatoin New Delhi.
Harvard
Punmia B.c, . (2011). Environmental Engineering -2 Wasterwater engineering. : Laxmi Publicatoin New Delhi.
MLA
Punmia B.c, . Environmental Engineering -2 Wasterwater engineering. : Laxmi Publicatoin New Delhi. 2011.