Gaya APA
WIDARSO, W., MARIANI, L.
(1994).
Complete english grammar
.
Yogyakarta:
Kanisius.
Gaya MLA
WIDARSO, Wishnubroto., MARIANI, Lulut.
"Complete english grammar".
Yogyakarta:
Kanisius,
1994.
Buku.