Christophersen, K.-A. ., E. . Elstad, T. . Solhaug, and A. . Turmo. “Antecedents of Norwegians Student Teachers’ Campus Time on Task”. International Journal of Learning, Teaching and Educational Research, vol. 10, no. 3, Mar. 2015, pp. 59-78, http://ijlter.myres.net/index.php/ijlter/article/view/1114.