Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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