Gaya APA
Riyanto, S. et al (2009).
A Complete Grammar for TOEFL Preparation with answers .
Yogyakarta:
Pustaka Pelajar.
Gaya MLA
Riyanto, Slamet. et al.
"A Complete Grammar for TOEFL Preparation with answers".
Yogyakarta:
Pustaka Pelajar,
2009.
Text.