Vivion, M. J., & Morgan, S. (1995). Circles of influence: A writer's rhetoric. Allyn and Bacon.
Cita Chicago Style (17a ed.)Vivion, Michael J., y Sarah Morgan. Circles of Influence: A Writer's Rhetoric. Boston: Allyn and Bacon, 1995.
Cita MLA (9a ed.)Vivion, Michael J., y Sarah Morgan. Circles of Influence: A Writer's Rhetoric. Allyn and Bacon, 1995.
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