Gaya APA
Soraya, I. et al
(2012).
Improving English skill: a best way to reach your future
.
Surabaya:
P2B UINSA.
Gaya MLA
Soraya, Irma. et al.
"Improving English skill: a best way to reach your future".
Surabaya:
P2B UINSA,
2012.
Buku.