Muthiah, Puvenesvary and Rao, Ravantharanathe (1996) Incidental learning of second language vocabulary through reading for pleasure. Discussion Paper. Universiti Utara Malaysia, Sintok. (Unpublished)

Abdullah, Syaharom and Rao, Ravantharanathe (1992) The relative importance of the language factor in writing the human resource requirement of the tourism industry in Langkawi. Discussion Paper. Universiti Utara Malaysia, Sintok. (Unpublished)

Rao, Ravantharanathe and Abdullah, Syaharom (2007) The role of the English language in the tourism industry. In: The Second Biennial International Conference on Teaching and Learning of English in Asia : Exploring New Frontiers (TELiA2), 14-16 June 2007, Holiday Villa Beach & Spa Resort, Langkawi. Faculty of Communication and Modern Languages, Universiti Utara Malaysia, Sintok, pp. 1-11. ISBN 978-983-42061-2-3