Williams, M. (1990). Wetlands: A threatened landscape. Basil Blackwell.
Chicago-čujuhus (17. p.)Williams, Michael. Wetlands: A Threatened Landscape. Oxford: Basil Blackwell, 1990.
MLA-čujuhus (9. p.)Williams, Michael. Wetlands: A Threatened Landscape. Basil Blackwell, 1990.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.