Mackus, Austris, Andris Snipkis, Inta Znotiņa, and Ieva Jurāne. 2015. “Website ‘Technical Drawing’ for Development of Spatial and Constructive Thinking”. SOCIETY. INTEGRATION. EDUCATION. Proceedings of the International Scientific Conference 4 (May): 450-56. https://doi.org/10.17770/sie2015vol4.406.