Reference books:

Environmental Engineering 2003
by N N Basak

Environmental Engineering 1 August 2013
by Howard S. Peavy and Donald R. Rowe

Environmental Engineering2015
by Arcadio P. Sincero

Environmental Engineering Vol. I Water Supply Engineering 2004
by Garg Sk

Elements of Environmental Engineering 2007
by K.N. Duggal

Environmental Engineering: A Design Approach 1998
by Sincero A.P

Sewage Disposal and Air Pollution Engineering 2008
by S. K. Garg

Introduction to Environmental Engineering and Science 2015
by Gilbert M. Masters

Textbook of Environmental Studies for Undergraduate Courses 2013
by Erach Bharucha

Introduction to Environmental Engineering and Science 2008
by Masters and Gilbert M

Environmental Chemistry 2006
by Shradha Sinha

Basics of Environmental Science and Engineering 2007
by P Sivashanmugam

Wastewater Engineering (Including Air Pollution) 1998
by Dr. B.C. Punmia and Ashok Kumar Jain