Applebee, A. N. / 1984 / Writing and reasoning / Review of Education Research 54 : 577 ~ 596 Bereitre, C. / 1987 / The psychology of written composition / Lawrence Erlbaum Connally, P. / 1989 / Writing and the ecology of learning, In Writing to learn mathematic and science / Teachers College Press Emig, J. / 1977 / Writing as a mode of learning / College Composition and Communication 28 (2) : 122 ~ 128 Flower, L. S. / 1980 / Identifyi ng the organization of writing process, In Cognitive process in writing / Lawrence Erlbaum : 4 ~ 30