एपीए उद्धरण

Gren, I. (1994). Economic evaluation of Wetlands: A survey. Sweden: Beijer Discusion Paper.

शिकागो स्टाइल उद्धरण

Gren, Ing-Marie. Economic Evaluation of Wetlands: A Survey. Sweden: Beijer Discusion Paper, 1994.

एमएलए उद्धरण

Gren, Ing-Marie. Economic Evaluation of Wetlands: A Survey. Sweden: Beijer Discusion Paper, 1994.