Gaya APA
NAPA, A, P.
(1992).
Basic English Exercises
(
Cet. 7)
.
Yogyakarta:
Penerbit Kanisius.
Gaya MLA
NAPA, A., Pieter.
"Basic English Exercises".
Cet. 7
Yogyakarta:
Penerbit Kanisius,
1992.
Text.