Bird Life International, Grey Fantail, Grey Fantail entry on the Birdlife International Database including explanation as to why grey and New Zealand fantails are not considered to be separate species.
Higgins, P.J.; Peter, J.M.; Cowling, S.J., eds. (2006). "Rhipidura fuliginosa Grey Wagtail"(PDF). Handbook of Australian, New Zealand & Antarctic Birds. Vol. 7, Boatbill to starlings, Part 7 A, Boatbill to larks. Melbourne, Victoria: Oxford University Press. pp. 174–213. ISBN978-0-19-553996-7.