The Asian waterfowl census 1987-91 : distribution and status of Asian waterfowl /
Perennou, Christian.
Mundkur, Taej.
Scott, Derek A.
Asian Wetland Bureau.
International Waterfowl and Wetlands Research Bureau.
Kuala Lumpur : Asian Wetland Bureau ; Gloucester : International Waterfowl and Wetlands Research Bureau,
1994.
Water birds
Bird populations