एपीए उद्धरण

Button,Kenneth J, & Verhoef,Erik T. Road pricing,Traffic congestion and the environment. Edward Elgar Publishing Ltd.

शिकागो स्टाइल उद्धरण

Button,Kenneth J, और Verhoef,Erik T. Road Pricing,Traffic Congestion and the Environment. U K: Edward Elgar Publishing Ltd.

एमएलए उद्धरण

Button,Kenneth J, और Verhoef,Erik T. Road Pricing,Traffic Congestion and the Environment. Edward Elgar Publishing Ltd.