1. Blackman R. L. &Eastop V. F.(2013).Aphids on the world’s plants: an online identification and information guide.www.aphidonworldplants.info
2. Great Tits Exploit Aphid Galls as a Source of Food
3. Phloem-sap feeding by animals: problems and solutions
4. ‘Sap‐sucking’ by woodpeckers in Britain;Gibbs J. N.;British Birds,1983
5. Biologia bawelnicy wiazowo‐porzeczkowej Eriosoma ulmi L. (Homoptera, Aphidoidea);Janiszewska‐Cichocka E.;Roczniki Nauk Rolniczych, E,1971