Παραπομπή APA

Hammer, M. J., & Viessman, W. (1999). Water supply and pollution control (6.).

Παραπομπή Chicago Style

Hammer, Mark J., και Warren Viessman. Water Supply and Pollution Control. 6. Newyork, Addison Wesley, 1999.

Παραπομπή MLA

Hammer, Mark J., και Warren Viessman. Water Supply and Pollution Control. 6. 1999.