Azar, Betty Schrampfer, 1941-
Understanding and using english grammer / Betty Schrampfer Azar
Longman, 2002
 Buku Teks
Azar, Betty Schrampfer, 1941-
Understanding and using english grammar
Binarupa Aksara, 1993
 Buku Teks
Azar, Betty Schrampfer, 1941-
Understanding and using English grammar
Prentice Hall Regents, 1989
 Buku Referensi
Holschuh, Louis W.
The functions of the English grammer/Louis W. Holscchuh
New York St. Martin's Press 1991,
 Buku Teks
Phythian, B.A.
English grammer/B.A. Phythian, Gordon Humphreys
London Hodder & Stoughton 1992,
 Buku Teks