Gw mau tau Rujukan dari Burung Tiong Gembala Kerbau. Jelasin dalam bahasa melayu

Grimmett, Inskipp and Inskipp, Birds of India ISBN 0-691-04910-6

Pell, A.S. & Tidemann, C.R. (1997) "The impact of two exotic hollow-nesting birds on two native parrots in savannah and woodland in eastern Australia", Biological Conservation, 79, 145-153. A study showing native birds being excluded from up to 80% of nesting sites in Canberra, Australia.