Gaya APA
Napa, P, A. (2000).
Basic English Grammar : With Clear Explanation, Examples, and Exercises (cet. 10).
Yogyakarta:
Kanisius.
Gaya MLA
Napa, Pieter, A..
"Basic English Grammar : With Clear Explanation, Examples, and Exercises".
cet. 10
Yogyakarta:
Kanisius,
2000.
Text.