Παραπομπή σε μορφή APA (7η εκδ.)
Dahl Th. E., Frayer W. E., & Johnson C. E. (1991). Wetlands: Status and trends in the conterminous United States Mid-1970 's to Mid-1980 's. Fish and Wildlife Service. National Wetlands Inventory (United States).
Παραπομπή σε μορφή Chicago (17η εκδ.)
Dahl Th. E., Frayer W. E., και Johnson C. E. Wetlands: Status and Trends in the Conterminous United States Mid-1970 'S to Mid-1980 'S. Fish and Wildlife Service. National Wetlands Inventory (United States), 1991.
Παραπομπή σε μορφή MLA (9th εκδ.)
Dahl Th. E., et al. Wetlands: Status and Trends in the Conterminous United States Mid-1970 'S to Mid-1980 'S. Fish and Wildlife Service. National Wetlands Inventory (United States), 1991.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.