Παραπομπή APA

Keishna Gopal. (2004). Fundamentals of water and waste water. APH.

Παραπομπή Chicago Style

Keishna Gopal. Fundamentals of Water and Waste Water. New Delhi: APH, 2004.

Παραπομπή MLA

Keishna Gopal. Fundamentals of Water and Waste Water. APH, 2004.