KRIŽO, Pavol et al. Evaluation of the most frequented forms of customer feedback acquisition and analysis. In Knowledge management in Organizations. international conference KMO 2018. Knowledge Management in Organizations : communications in computer and information science. 1. vyd. - Ham : Springer Verlag, 2018. ISBN 978-3-319-95203-1, s. 562-573. Available on: https://doi.org/10.1007/978-3-319-95204-8_47.