Gaya APA
Leo, S. et al
(2007).
English for academic purpose : essay writing/ Sutanto Leo
(
Ed. 1)
.
Jogjakarta:
ANDI.
Gaya MLA
Leo, Sutanto. et al.
"English for academic purpose : essay writing/ Sutanto Leo".
Ed. 1
Jogjakarta:
ANDI,
2007.
Text.