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