Verduin, J. R., & Clark, T. A. (1991). Distance education: The foundations of effective practice. Jossey-Bass.
芝加哥风格引文Verduin, John R., 与 Thomas A. Clark. Distance Education: The Foundations of Effective Practice. San Francisco: Jossey-Bass, 1991.
MLA引文Verduin, John R., 与 Thomas A. Clark. Distance Education: The Foundations of Effective Practice. Jossey-Bass, 1991.
警告：这些引文格式不一定是100％准确.