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- KULTAN, Jaroslav - POLJOVKA, Peter. Improving the Quality of Technology. In New Teaching Approaches in Technology. - Nitra : Constantine the Philosopher University in Nitra, Faculty of Education, 2017. ISBN 978-80-558-1149-9, s. 148-260 CD-ROM [5,6 AH].
- KULTAN, Jaroslav - POLJOVKA, Peter. Improving the Quality of Technology. In New teaching approaches in technology. - Nitra : Constantine the Philosopher University in Nitra, Faculty of Education, 2017. ISBN 978-80-558-1148-2, s. 148-247 [5,15 AH].