Dugan, P. J. (1990). Wetland conservation: A review of current issues and required action. IUCN - The World Conservation Union.
Citazione stile Chigago Style (17a edizione)Dugan, Patrick J. Wetland Conservation: A Review of Current Issues and Required Action. Gland, Switzerland: IUCN - The World Conservation Union, 1990.
Citatione MLA (9a ed.)Dugan, Patrick J. Wetland Conservation: A Review of Current Issues and Required Action. IUCN - The World Conservation Union, 1990.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.