International Association for the Evaluation of Educational Achievement, Gorman, T. P., Purves, A. C., & Degenhart, R. E. (1988). The IEA study of written composition. Published for the International Association for the Evaluation of Educational Achievement by Pergamon Press.
Παραπομπή σε μορφή Chicago (17η εκδ.)International Association for the Evaluation of Educational Achievement, T. P. Gorman, Alan C. Purves, και R. E. Degenhart. The IEA Study of Written Composition. Oxford, England ; New York: Published for the International Association for the Evaluation of Educational Achievement by Pergamon Press, 1988.
Παραπομπή σε μορφή MLA (8th εκδ.)International Association for the Evaluation of Educational Achievement, et al. The IEA Study of Written Composition. Published for the International Association for the Evaluation of Educational Achievement by Pergamon Press, 1988.
