Gaya APA
Riyanto, S. et al (2010).
essentials of english grammar for fluent english; book 1 (-1).
Yogyakarta:
Pustaka Pelajar.
Gaya MLA
Riyanto, Slamet. et al.
"essentials of english grammar for fluent english; book 1".
-1
Yogyakarta:
Pustaka Pelajar,
2010.
Text.