APA (7 वां संस्करण) प्रशस्ति पत्र

Metcalf. (2012). WASTEWATER ENGINEERING: TREATMENT AND REUSE (4 TH.). TMH.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Metcalf. WASTEWATER ENGINEERING: TREATMENT AND REUSE. 4 TH. NEW DELHI: TMH, 2012.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Metcalf. WASTEWATER ENGINEERING: TREATMENT AND REUSE. 4 TH. TMH, 2012.