Cavanaugh, C. (2009) Virtual Schooling Standards and Best Practices for Teacher Education. Journal of Technology and Teacher Education, 17, 1059-7069.
 Patrick, S. and Powell, A. (2009) A Summary of Research on the Effectiveness of K-12 Online Learning. International Association for K-12 Online Learning.
 The National Council for Higher Education (2009) Instructions for the Preparation of Documents for the Accreditation of Degree Programs at a Distance.