Rujukan WikiPedia: Cockatiel http://www.birdhobbyist.com/parrotcolour/cocktiel/... http://birdsinbackyards.net/species/Nymphicus-holl... http://www.euronet.nl/users/hnl/ http://web.archive.org/web/20060519005713/http://w... http://dmoz.org/Recreation/Pets/Birds/Species/Parr... http://www.iucnredlist.org/details/142448
