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Pârâu, Liviu; Strubbe, Diederik; Mori, Emiliano; Menchetti, Mattia; Ancillotto, Leonardo; van Kleunen, André; White, Rachel; Luna, Álvaro; Hernández-Brito, Dailos; Le Louarn, Marine; Clergeau, Philippe; Albayrak, Tamer; Franz, Detlev; Braun, Michael; Schroeder, Julia; Wink, Michael (2016). "Rose-ringed Parakeet Populations and Numbers in Europe: A Complete Overview". The Open Ornithology Journal. 9: 1–13.
Invasive ring-necked parakeets Psittacula krameria in Belgium: habitat selection and impact on native birds by Diederik Strubbe and Erik Matthysen
Breeding Habitats of the Rose-Ringed Parakeet (Psittacula krameri) in the Cultivations of Central Punjab by Hammad Ahmad Khan, Mirza Azhar Beg and Akbar Ali Khan
Population estimates of non-native rose-ringed parakeets Psittacula krameri (Scopoli, 1769) in the Durban Metropole, KwaZulu-Natal Province, South Africa by Tinyiko C. Shivambu, Ndivhuwo Shivambu & Colleen T. Downswww.researchgate.net...Population-Biology-of-the-Introduced-Rose-Ringed-Parakeet-Psittacula-krameri-in-the-UK.pdf