Gaya APA
Groth, C. et al
(2013).
Essay Writing : English for Academic Purpose
(
Edisi Kedua)
.
Yogyakarta:
ANDI.
Gaya MLA
Groth, Cheryl. et al.
"Essay Writing : English for Academic Purpose".
Edisi Kedua
Yogyakarta:
ANDI,
2013.
Text.