NIŽNÍKOVÁ, Zuzana. Kvalita cestovného ruchu na Slovensku. In Quality and leading innovation. International scientific [and virtual] conference. Quality and leading innovation : proceedings : international scientific [and virtual] conference : October 5 - 7, 2015, Košice (SK), Uzhgorod (UA). - Košice ; Uzgorod : Faculty of Business Economics with seat in Košice : Uzgorod National University, 2015. ISBN 978-617-589-103-2, p. 101-102 CD-ROM. PMVP I-15-109-00.