Gaya APA
Napa, P, A. (2011).
Basic English Grammar : With Clear Explanation Examples and Exercises (Cet. 18).
Yogyakarta:
Kanisius.
Gaya MLA
Napa, Pieter, A..
"Basic English Grammar : With Clear Explanation Examples and Exercises".
Cet. 18
Yogyakarta:
Kanisius,
2011.
Monograf.