BEŤÁK, Boris. The educational aspect of the seasonal activities within the framework of physical education on the first stage of primary schools in the Martin region. In Acta Universitatis Matthiae Belii : physical education and sport. 1. vyd. - Banská Bystrica : Univerzita Mateja Bela, Fakulta humanitných vied, 2011. ISSN 1338-0974, 2011, roč. 3, č. 2, s. 25-33.