Gaya APA
Riyanto, S. et al (2010).
Essential of English grammar for fluent English (books three) .
Yogyakarta:
Pustaka Pelajar.
Gaya MLA
Riyanto, Slamet. et al.
"Essential of English grammar for fluent English (books three)".
Yogyakarta:
Pustaka Pelajar,
2010.
Text.