ROZBORILOVÁ, Dária. Wealth, Poverty and Happiness in the Context of the Difficult Conditions of the Early 21st Century. In 1st international M-Sphere conference for multidisciplinarity in science and business : book of abstracts. - Dubrovnik : Accent, 2012. ISBN 978-953-99762-9-1, p. 10. VEGA 1/0174/11, ITMS 26240120032. Available on Internet: <https://issuu.com/tvranes/docs/book_of_abstracts_m-sphere_conference_2012/24>