Gaya APA
Brinton, E., ...[et.al], .
(1971).
Active context english book 2a
.
London:
Macmillan Education Limited.
Gaya MLA
Brinton, Ethel., ...[et.al], .
"Active context english book 2a".
London:
Macmillan Education Limited,
1971.
Text.