Modern methodological procedures in science I. - IV. [elektronický zdroj] : a methodological handbook for PhD students / [author Adriana Kolesárová et al.] . Nitra :  Slovak University of Agriculture , 2023 . 1 online zdroj (238 s) . ISBN 978-80-552-2624-8
Digitálna knžnica http://www.slpk.sk/eldo/2023/dl/9788055226248/9788055226248.pdf .