| 1 | Pankratz, T.M., 2001, Environmental Engineering Dictionary and Directory, 335 p., Lewis Publishers. |
| 2 | Alley, E.R. 2007. Water Quality Control Handbook, ISBN-ISSN: 978-0-07-146760-5, 2nd ed., McGraw Hill. |
| 3 | Prof. Dawei Han, Concise Environmental Engineering, 2012, ISBN: 978-87-403-0197-7 |