(1971) Convergence and creolization – a case from the Indo-Aryan/Dravidian border in India. In Dell Hymes (Ed.), Pidginization and creolization of languages (pp. 151–168). Cambridge: Cambridge University Press.
Gupta, A. F.
(1990) A study of the acquisition and use of interrogates and questions in the English of preschool Chinese Singaporeans. Doctoral dissertation, University of York.
Thomason, S. G., & Kaufman, T.
(1988) Language contact, creolization, and genetic linguistics. Berkeley: University of California Press.