Gaya APA
Leo, S.
(2007).
English For Purpose : Essay Writing
(
Cet. 1)
.
Yogyakarta:
Andi.
Gaya MLA
Leo, Sutanto.
"English For Purpose : Essay Writing".
Cet. 1
Yogyakarta:
Andi,
2007.
BUKU TEKS.