Ažubalis, Algirdas. “The pupil’s Individual Work skills’ Development Teaching Mathematics at Lithuanian Schools (5–9 Decades of the 20th Century)”. Lietuvos matematikos rinkinys 43, no. spec. (December 22, 2003): 319–323. Accessed May 20, 2024. https://www.journals.vu.lt/LMR/article/view/32433.