ebrary, Inc, & Hart, S. (2004). Learning without limits. Open University Press.
芝加哥风格引文ebrary, Inc, 与 Susan Hart. Learning Without Limits. Maidenhead, Berkshire, England: Open University Press, 2004.
MLA引文ebrary, Inc, 与 Susan Hart. Learning Without Limits. Open University Press, 2004.
警告：这些引文格式不一定是100％准确.