The Online Writing Lab (OWL) at Purdue University houses writing resources and instructional material, and we provide these as a free service of the Writing Lab at Purdue. Students, members of the community, and users worldwide will find information to assist with many writing projects.
M. Scardamalia, and C. Bereiter. Advances in applied psycholinguistics, 2: Reading, writing, and language learning, Cambridge University Press, Cambridge, (1987)