1. J. del Hoyo and N.J Collar. HBW and BirdLife International Illustrated Checklist of the Birds of the World. 2: Passerines. (Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK. 2016).
2. J.L Long. Journal of the Department of Agriculture, Western Australia Series 4, 10(5), (1969).
3. V. Sophonrat, P. D. Round, T. Savini, G. A. Gale. Raffles Bulletin of Zoology 67, 448–458, (2019).
4. J.A. Eaton, C. R. Shepherd, F. E. Rheindt, J. B. C. Harris, S. (B.) Van Balen, D. S. Wilcove, & N. J. Collar. FORKTAIL, 31, 1–12. (2015).
5. A.J. Whitten, M. Mustafa, & G.S. Henderson. The ecology of Sulawesi (Gadjah Mada University Press, Yogyakarta, Indonesia, 1987), p. 777.