Gaya APA
Groth, C., Kandra, I, L. (2007).
Essay Writing : English For Academic Purposes with Exercises and Answer Key .
Yogyakarta:
Andi.
Gaya MLA
Groth, Cheryl., Kandra, Irene, L..
"Essay Writing : English For Academic Purposes with Exercises and Answer Key".
Yogyakarta:
Andi,
2007.
Text.