Owen M., Callaghan D., Kirby J. 2003. Guidelines on Avoidance of Introductions of Non-native Waterbird Species. In Fourth Meeting of the Technical Committee of the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA). Secretariat of the Agreement on the Conservation of African-Eurasian Migratory Waterbirds, Tashkent, Uzbekistan : UNEP/AEWA Secretariat. 33 pp.

Owen M., Callaghan D., Kirby J. 2003. Guidelines on Avoidance of Introductions of Non-native Waterbird Species. In Fourth Meeting of the Technical Committee of the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA). Secretariat of the Agreement on the Conservation of African-Eurasian Migratory Waterbirds, Tashkent, Uzbekistan : UNEP/AEWA Secretariat. 33 pp.