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Hackett, Shannon J.; และคณะ (2008). "A Phylogenomic Study of Birds Reveals Their Evolutionary History". Science. 320 (1763): 1763–1768. doi:10.1126/science.1157704. PMID18583609.
Battisti, A; Bernardi, M.; Ghiraldo, C. (2000). "Predation by the hoopoe (Upupa epops) on pupae of Thaumetopoea pityocampa and the likely influence on other natural enemies". Biocontrol. 45 (3): 311–323. doi:10.1023/A:1009992321465. S2CID11447864.