Gramley, Stephan
A survey of modern English
Routledge , 1992
 Buku Teks SO
Basic skill in English : green level
edited by Joy Littell
McDougal Littell, 1985
 Buku Teks SO
Huddleston, Rodney
Introduction to the grammar of English
Cambridge University Press, 1984
 Buku Teks SO
Collins, Peter
English grammar: an introduction
Palgrave Macmillan, 2020
 Buku Teks SO
Huddleston, Rodney
Introduction to the grammar of English
Cambridge University Press, 1988
 Buku Teks SO