9[5]John P. Heidi W. &Ho Mian Lian. The New Englishes. Routledge Kegan Paul ple. 1984,p. 95.
10[8]Peter Stervens: "What Is Standard English?" from "Readings in English as sn International Language" (Larry E,Smith, ed. ), Pergamon Institute of English, 1983,p. 88.