Citazione Stile APA (7a Edizione)

Verduin, J. R., & Clark, T. A. (1991). Distance education: The foundations of effective practice. Jossey-Bass.

Citazione stile Chigago Style (17a edizione)

Verduin, John R., e Thomas A. Clark. Distance Education: The Foundations of Effective Practice. San Francisco: Jossey-Bass, 1991.

Citatione MLA (8a ed.)

Verduin, John R., e Thomas A. Clark. Distance Education: The Foundations of Effective Practice. Jossey-Bass, 1991.