CILENŠEK, Katja and JAMŠEK, Janez, 2010, Pupils’ waste materials and ecological awareness in a design and technology class in Slovenian elementary schools. Journal of energy technology [online]. 2010. [Accessed 22 January 2025]. Retrieved from: http://www.fe.uni-mb.si/images/stories/jet/e-jet/jet_3-1-final.pdf