English: Breeding range and geographical variation of the White Wagtail (Motacilla alba) – eleven subspecies and three subspecies groups based on the color of the back and head patterns in male breeding plumage
Deutsch: Brutverbreitung und geografische Variation der Bachstelze (Motacilla alba) – elf Unterarten in drei Unterartengruppen variieren in der Farbe des Rückens und der Kopfzeichnungen der Männchen im Brutkleid
Urs N. Glutz von Blotzheim, Kurt M. Bauer: Handbuch der Vögel Mitteleuropas (HBV). Band 10/II, Passeriformes (1. Teil), Motacillidae – Prunellidae, AULA-Verlag, 1985/2001, ISBN3-923527-00-4
J. Alonso, I. Henderson, F. Purroy: White Wagtail (Motacilla Alba) in in W. J. M. Hagemeijer, M. J. Blair: The EBCC Atlas of European Breeding Birds – their distribution and abundance, T & A D Poyser, London 1997, ISBN0-85661-091-7, S. 498–499
Joseph Morlan: Status and Identification of forms of White Wagtail (Motacilla alba) in Western North America, Continental Birdlife, Vol. 2, Nr. 2, April 1981, S. 37–50
Helmut Ölschlegel: Die Bachstelze, Die neue Brehm-Bücherei, A. Ziemsen Verlag, Wittenberg Lutherstadt 1985, (ISBN3-89432-359-0, unveränderte Neuauflage von 2005)
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