Cita APA (7a ed.)

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.