1. Agriculture, Forestry and Fishery Statistics,2015
2. Apple and Pear Production by country and year (2003–2012)http://www.wapa-association.org/asp/page_1.asp?doc_id=446
3. Food and Agricultural Organization of the United Nations, Statistics Divisionhttp://faostat3.fao.org/home/E
4. Ministry of Agriculture and Rural Development in Romania, National Rural Development Plan 2014–2020, 2015http://www.madr.ro/docs/dezvoltare-rurala/programare-2014-2020/PNDR_2014_-_2020_01.07.2014.pdf
5. Quality and efficiency of apple orchard protection affected by sprayer type and application rate