Gaya APA
Leo, S. et al
(2007).
English For Academic Purpose Essay Writing
(
Ed.1)
.
Yogyakarta:
CV Andi Offset.
Gaya MLA
Leo, Sutanto. et al.
"English For Academic Purpose Essay Writing".
Ed.1
Yogyakarta:
CV Andi Offset,
2007.
Text.