एपीए उद्धरण

 Worrell, W. A. (2011).  Solid waste engineering, si.  South-Western, Cengage Learning.

शिकागो स्टाइल उद्धरण

 Worrell, William A.  Solid Waste Engineering, Si.  South-Western, Cengage Learning, 2011.

एमएलए उद्धरण

 Worrell, William A.  Solid Waste Engineering, Si.  South-Western, Cengage Learning, 2011.