NOVOTNÁ, Nadežda - VLADOVIČOVÁ, Nadežda. Physical-education leisure time activities of younger school-aged children. In Acta Universitatis Matthiae Belii. Vol. 5, no. 5. - Banská Bystrica : Pedagogická fakulta UMB, 2003. ISBN 80-8055-848-5, 2003, vol. 5, no. 5, s. 38-42.