Gaya APA
maggs, M. (1978).
Programmed English : A self-introductional course 3 .
the United States of America:
Groliernternational.
Gaya MLA
maggs, Margaret.
"Programmed English : A self-introductional course 3".
the United States of America:
Groliernternational,
1978.
Koleksi Elektronik.