Management challenges in the 21st century. International conference. Management challenges in the 21st century : transport and logistics: opportunity for Slovakia in the era of knowledge economy : conference proceedings : Bratislava, april 19, 2011. Trenčín : School of Management / Vysoká škola manažmentu v Trenčíne, 2011. CD-ROM. VEGA 1/0016/09. ISBN 978-80-89306-10-7.