Wann, J., Wing, A. M., & Sovik, N. (1991). Development of graphic skills: Research perspectives and educational implications. Academic Press.
Παραπομπή σε μορφή Chicago (17η εκδ.)Wann, John, Alan M. Wing, και Nils Sovik. Development of Graphic Skills: Research Perspectives and Educational Implications. London: Academic Press, 1991.
Παραπομπή σε μορφή MLA (9th εκδ.)Wann, John, et al. Development of Graphic Skills: Research Perspectives and Educational Implications. Academic Press, 1991.
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