Voelker, Gary (2002): Systematics and historical biogeography of wagtails: Dispersal versus vicariance revisited.
(인도 서벵골 주) 어린 새 루마니아 부쿠레슈티 주변 Voelker, Gary (2002): Systematics and historical biogeography of wagtails: Dispersal versus vicariance revisited.