IFIP TC 3/WG 3.1 Working Conference on Informatics and the Teaching of Mathematics Sofia, Bulgaria, Johnson, D. C., & Lovis, F. B. (1987). Informatics and the teaching of mathematics: Proceedings of the IFIP TC 3/WG 3.1 Working Conference on Informatics and the Teaching of Mathematics : Sofia, Bulgaria, 16-18 May, 1987. North-Holland.
Παραπομπή σε μορφή Chicago (17η εκδ.)IFIP TC 3/WG 3.1 Working Conference on Informatics and the Teaching of Mathematics Sofia, Bulgaria, D. C. Johnson, και F. B. Lovis. Informatics and the Teaching of Mathematics: Proceedings of the IFIP TC 3/WG 3.1 Working Conference on Informatics and the Teaching of Mathematics : Sofia, Bulgaria, 16-18 May, 1987. Amsterdam ; New York: North-Holland, 1987.
Παραπομπή σε μορφή MLA (8th εκδ.)IFIP TC 3/WG 3.1 Working Conference on Informatics and the Teaching of Mathematics Sofia, Bulgaria, et al. Informatics and the Teaching of Mathematics: Proceedings of the IFIP TC 3/WG 3.1 Working Conference on Informatics and the Teaching of Mathematics : Sofia, Bulgaria, 16-18 May, 1987. North-Holland, 1987.
