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Metzmacher, Maxime (1990). "Climatic factors, activity budgets and breeding success of the Spanish Sparrow [Passer hispaniolensis (Temm.)]". In Pinowski, J.; Summers-Smith, J. D. (eds.). Granivorous birds in the agricultural landscape(PDF). Warszawa: Pánstwowe Wydawnictom Naukowe. pp. 11–29. ISBN978-83-01-08460-8. Archived(PDF) from the original on 2012-10-22. Retrieved 2010-05-21.
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Töpfer, Till (2006). "The taxonomic status of the Italian Sparrow – Passer italiae (Vieillot 1817): Speciation by stabilised hybridisation? A critical analysis". Zootaxa. 1325: 117–145. doi:10.11646/zootaxa.1325.1.8. ISSN1175-5334.