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Inskipp, Carol; Inskipp, Tim & Sherub (2000): The ornithological importance of Thrumshingla National Park, Bhutan. Forktail14: 147-162. PDF fulltextArkiverad 11 oktober 2008 hämtat från the Wayback Machine.
ubc.ca
zoology.ubc.ca
Irwin, D.E.; Alström, Per; Olsson, U. & Benowitz-Fredericks, Z.M. (2001): Cryptic species in the genus Phylloscopus (Old World leaf warblers). Ibis143(2): 233–247. doi:10.1111/j.1474-919X.2001.tb04479.xPDF fulltext
web.archive.org
Inskipp, Carol; Inskipp, Tim & Sherub (2000): The ornithological importance of Thrumshingla National Park, Bhutan. Forktail14: 147-162. PDF fulltextArkiverad 11 oktober 2008 hämtat från the Wayback Machine.