(PDF)于2018-05-17). 维基共享资源上的相关多媒体资源:英迪戈 官方网站 Indigo Love of Reading Foundation website Indigo pulls controversial Harper's off the shelves (页面存档备份,存于互联网档案馆) - a Globe
International. Passerina cyanea. The IUCN Red List of Threatened Species. 2012 [26 November 2013]. old-form url Indigo Bunting. All About Birds. Cornell