Cita APA (7th ed.)

Dugan, P. J. (1990). Wetland conservation: A review of current issues and required action. IUCN - The World Conservation Union.

Cita Chicago (17th ed.)

Dugan, Patrick J. Wetland Conservation: A Review of Current Issues and Required Action. Gland, Switzerland: IUCN - The World Conservation Union, 1990.

Cita MLA (9th ed.)

Dugan, Patrick J. Wetland Conservation: A Review of Current Issues and Required Action. IUCN - The World Conservation Union, 1990.