Chia Siew Hock.1977. An investigation into language use among secondary four pupils in Singapore. The English language in Singapore, ed. by William Crewe, 157-70. Singapore: Eastern Universities Press.
2.
Richards, Jack C. and Tay, Mary W.J.1977. The la particle in Singapore English. The English language in Singapore, ed. by William Crewe , 145-56. Singapore : Eastern Universities Press.
3.
Wang Li ?. 1944. A theory of Chinese grammar. ? Vol. I. Peking.