APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (8. p.)

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