APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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