Azar, Betty Schrampfer, 1941-
Understanding and using English grammar
Prentice Hall Regents, 1989
 Buku Referensi
Azar, Betty Schrampfer, 1941-
Understanding and using english grammer
Pearson Education, 2009
 Buku Teks
Makkink, H.J.
An English grammar
Nijgh and Van Ditmar, 1951
 Buku Teks SO
Azar, Betty Schrampfer, 1941-
Understanding and using english grammer / Betty Schrampfer Azar
Longman, 2002
 Buku Teks
Newby, Michael
The structure of English : a handbook of English grammar
Cambridge University Press, 1988
 Buku Teks SO