Jønsson, K.A.; Bowie, R.C.K.; Nylander, J.A.A.; Christidis, L.; Norman, J.A.; Fjeldså, J. Biogeographical history of cuckoo-shrikes (Aves: Passeriformes): transoceanic colonization of Africa from Australo-Papua. Journal of Biogeography. 2010, 37 (9): 1767–1781. S2CID 52105369. doi:10.1111/j.1365-2699.2010.02328.x.
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Jønsson, K.A.; Bowie, R.C.K.; Nylander, J.A.A.; Christidis, L.; Norman, J.A.; Fjeldså, J. Biogeographical history of cuckoo-shrikes (Aves: Passeriformes): transoceanic colonization of Africa from Australo-Papua. Journal of Biogeography. 2010, 37 (9): 1767–1781. S2CID 52105369. doi:10.1111/j.1365-2699.2010.02328.x.