HALENÁROVÁ, Mária - GÁLL, Jozef. Impact of Economic Indicators of Sustainable Development of Slovak Spas. In Central and Eastern Europe in the Changing Business Environment. International Joint Conference. Central and Eastern Europe in the Changing Business Environment : 23th International Joint Conference, 18 - 19 May 2023, Prague, Czech Republic and Bratislava, Slovak Republic. - Bratislava : Vydavateľstvo EKONÓM, 2023. ISBN 978-80-225-5065-9, p. 24.