Karmelita PJANİC, Edin LİĐAN. “One Usage of Geogebra in Enhancing Pre-Service Mathematics Teachers’ Content Knowledge”. Turkish Journal of Computer and Mathematics Education (TURCOMAT), vol. 6, no. 1, Apr. 2015, pp. 18-30, https://turcomat.org/index.php/turkbilmat/article/view/77.