Gaya APA
Riyanto, S. et al (2010).
ESSENTIALS OF ENGLISH GRAMMAR FOR FLUENT ENGLISH BK.1 .
Yogyakarta:
PUSTAKA PELAJAR.
Gaya MLA
Riyanto, Slamet. et al.
"ESSENTIALS OF ENGLISH GRAMMAR FOR FLUENT ENGLISH BK.1".
Yogyakarta:
PUSTAKA PELAJAR,
2010.
Text.