Taylor Walsh, author, William G. Bowen, foreword, Unlocking the Gates: How and Why Leading Universities Are Opening Up Access to Their Courses, Princeton University Press (December 28, 2010), hardcover, 320 pages
"The X Factor"(页面存档备份,存于互联网档案馆) Brainstorm blog post by Kevin Carey Chronicle of Higher Education May 2, 2012