Endurance development among schoolchildren in their early puberty age

KARPLJUK, Damir et al. Endurance development among schoolchildren in their early puberty age. In Sport and physical education of the youth. 1. vyd. - Banská Bystrica : Univerzita Mateja Bela, Fakulta humanitných vied, 2009. ISBN 978-80-8083-726-6, s. 68-84.