Gaya APA
Azar, B, S. (1993).
Understanding And Using English Grammar : Betty Schrampfer Azar (Ed.2, Cet.1).
Jakarta:
Bina Rupa Aksara.
Gaya MLA
Azar, Betty, Schrampfer.
"Understanding And Using English Grammar : Betty Schrampfer Azar".
Ed.2, Cet.1
Jakarta:
Bina Rupa Aksara,
1993.
Buku.