Cheke, Anthony S., and Ruth E. Ashcroft. “Vocal Gatherings of Blackcaps Sylvia Atricapilla in Olive Trees on a Greek Island”. Rivista Italiana di Ornitologia 85, no. 2 (August 2, 2016): 36–37. Accessed November 27, 2024. https://sisn.pagepress.org/rio/article/view/237.