Gaya APA
Ikom, D, C, S, P, A, R, S, R, A, S. (2003).
Doors to English Grammar 2 .
Yogyakarta:
Yudhistira.
Gaya MLA
Ikom, Diana, Christianti,, S., Pd,, Astrid, Robertha,, S.S,, Ruth, Anasthasia,, S..
"Doors to English Grammar 2".
Yogyakarta:
Yudhistira,
2003.
.