Gaya APA
Gumpol, W.
(1995).
Mastery of Sixteen Tenses
.
Yogyakarta:
Penerbit Kanisius.
Gaya MLA
Gumpol, W.Y..
"Mastery of Sixteen Tenses".
Yogyakarta:
Penerbit Kanisius,
1995.
Text.