ILLÉS, Csaba Bálint et al. Impacts of corporate taxes on the R&D&I activities of agricultural enterprises. In Business management - practice and theory in the 21st century. 1. vyd. 1 CD-ROM (833 s.). ISBN 978-80-552-1026-1. Manažment podniku - prax a teória 21. storočia. Nitra : Slovak University of Agriculture, 2013, s. 256-261. Dostupné na internete:<http://www.slpk.sk/eldo/2013/zborniky/032-13/se2/Illes_HustineBeres_Tatar_Horanyi.pdf>