Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.