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22 Archived from the original on 2007-07-11. Kristin, A (2001). Family Upupidae (Hoopoes). In Josep, del Hoyo; Andrew, Elliott; Sargatal, Jordi. Handbook of the Birds of the World. Volume 6, Mousebirds to Hornbills. Barcelona: Lynx Edicions. pp. 396–411. ISBN 84-8733430-X. Linnaeus, C (1758). Systema naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Tomus I. Editio decima, reformata. Holmiae.

Gazelle : The Palestinian Biological Bulletin (ISSN 0178 – 6288) . Number 139, July 2016, pp. 1-23. | Page 22