Gaya APA
Azar, B, S. (1992).
Fundamentals of english grammar / Betty Schrampfer Azar (2nd.ed.).
:
Regent/Pranticehall.
Gaya MLA
Azar, Betty, Schrampfer.
"Fundamentals of english grammar / Betty Schrampfer Azar".
2nd.ed.
:
Regent/Pranticehall,
1992.
Referensi.