Dugan, P. J. (1990). Wetland conservation: A review of current issues and required action. IUCN - The World Conservation Union.
Citace podle Chicago (17th ed.)Dugan, Patrick J. Wetland Conservation: A Review of Current Issues and Required Action. Gland, Switzerland: IUCN - The World Conservation Union, 1990.
Citace podle MLA (9th ed.)Dugan, Patrick J. Wetland Conservation: A Review of Current Issues and Required Action. IUCN - The World Conservation Union, 1990.
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