Gaya APA
Riyanto, S. et al (2010).
Essentials of english vocabularies for fluent speaking .
Yogyakarta:
Pustaka Pelajar.
Gaya MLA
Riyanto, Slamet. et al.
"Essentials of english vocabularies for fluent speaking".
Yogyakarta:
Pustaka Pelajar,
2010.
Text.