Rao, A. P., S. Manjunath, R. Manjula, and P. Sridhar. “Intonation in the WH and Y-N Questions of Mothers of Hearing Impaired: Influence of Type of Partner in Communication”. Journal of All India Institute of Speech and Hearing, Vol. 29, no. 2, Dec. 2010, pp. 269-82, http://203.129.241.91/jaiish/index.php/aiish/article/view/1323.