Tolong jelaskan mengenai Rujukan dari Silverbird (burung) dalam bahasa melayu

Dale A. Zimmerman, Birds of Kenya and Northern Tanzania, Princeton University Press, 1999

del Hoyo, J.; Elliot, A. & Christie D. (editors). (2006). Handbook of the Birds of the World. Volume 11: Old World Flycatchers to Old World Warblers. Lynx Edicions. .