Citazione Stile APA (7a Edizione)

Vivion, M. J., & Morgan, S. (1995). Circles of influence: A writer's rhetoric. Allyn and Bacon.

Citazione stile Chigago Style (17a edizione)

Vivion, Michael J., e Sarah Morgan. Circles of Influence: A Writer's Rhetoric. Boston: Allyn and Bacon, 1995.

Citatione MLA (9a ed.)

Vivion, Michael J., e Sarah Morgan. Circles of Influence: A Writer's Rhetoric. Allyn and Bacon, 1995.