एपीए उद्धरण

Callan, Manonmoney, N., Thomas, & Valuthi Varagunasingh, T. (2007). Environmental economics. Cengage Learning.

शिकागो स्टाइल उद्धरण

Callan, N. Manonmoney, Thomas, और T. Valuthi Varagunasingh. Environmental Economics. Australia: Cengage Learning, 2007.

एमएलए उद्धरण

Callan, et al. Environmental Economics. Cengage Learning, 2007.