Books by H. G. Widdowson. Amazon.com. http://www.amazon.com/H.-G.-Widdowson/e/B001HP63FS
ELTNEWS.com. (2005). Interview with Henry G. Widdowson. Retrieved from http://www.eltnews.com/features/interviews/2005/12/interview_with_henry_g_widdows.html
WorldCat Identities. Retrieved from http://worldcat.org/identities/lccn-n50-16241
Wu, A. (2009, January 26). Henry Widdowson. The NNEST of the Month: February 2009. Retrieved from http://nnesintesol.blogspot.com/2009/01/henry-g-widdowson.html
ELTNEWS.com. (2005). Interview with Henry G. Widdowson. Retrieved from http://www.eltnews.com/features/interviews/2005/12/interview_with_henry_g_widdows.html
WorldCat Identities. Retrieved from http://worldcat.org/identities/lccn-n50-16241
Wu, A. (2009, January 26). Henry Widdowson. The NNEST of the Month: February 2009. Retrieved from http://nnesintesol.blogspot.com/2009/01/henry-g-widdowson.html