1. Directions in reintroduction biology;Armstrong;Trends Ecol Evol,2008
2. Asian Turtle Trade Working Group 2000 Palea steindachneri www.iucnredlist.org
3. BirdLife International 2013a Cacatua sulphurea www.iucnredlist.org
4. BirdLife International 2013b Psittacula alexandri www.iucnredlist.org
5. BirdLife International 2016 Acridotheres javanicus. The IUCN Red List of Threatened Species, version 2016.3. www.iucnredlist.org