"Toward a Learning Economy" by Stephen A. Herzenberg, John A. Alic, and Howard Wial (页面存档备份,存于互联网档案馆). 2006. Toward a Learning Economy. URL accessed 3 May
Introduction to Industrial Organisation, Massachusetts Institute of Technology Press, 2000, page 223. ISBN 0-262-03286-4 Philip Nelson, "Information and Consumer
Introduction to Industrial Organisation, Massachusetts Institute of Technology Press, 2000, page 223. ISBN 0-262-03286-4 Philip Nelson, "Information and Consumer
Introduction to Industrial Organisation, Massachusetts Institute of Technology Press, 2000, page 223. ISBN 0-262-03286-4 Philip Nelson, "Information and Consumer