PORVAZNÍK, Ján - LJUDVIGOVÁ, Ivana. The Pillars of Holistic Governance (Leadership and Management) of Global Environment on Planet Earth. In 11th EBES conference - Ekaterinburg : program & abstract book, september 12-14, 2013, Ekaterinburg, Russia. - Istanbul : Teknik Basim Matbaacilik, 2013. ISBN 978-605-64002-2-3, s. 60-61.