Gaya APA
Riyanto, ,.
(2010).
Essentials of english grammar for fluent english
(
Cet.1)
.
Yogyakarta:
Pustaka Pelajar.
Gaya MLA
Riyanto, ,Slamet.
"Essentials of english grammar for fluent english".
Cet.1
Yogyakarta:
Pustaka Pelajar,
2010.
Art Original.