References
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- diSessa , A.A. 1992 . “ Images of learning ” . In Computer-based environments and problem solving , Edited by: de Corte , E. , Linn , M.C. , Mandl , H. and Verschaffel , L. 19 – 40 . Berlin : Springer-Verlag .
- Smith , Jones and Harris . 1958 . Subsequently the following form should be used: Smith et al (1958). Citations in the text should be listed alphabetically, not by year of publication , Multi-authored citations should be given in full on their first appearance in the text of the article, for example: