Gaya APA
Pora,Yusron, . (2003).
Develop your english vocabulary, grammar and idiom/ Yusron Pora .
Yogyakarta:
Pustaka Pelajar.
Gaya MLA
Pora,Yusron, .
"Develop your english vocabulary, grammar and idiom/ Yusron Pora".
Yogyakarta:
Pustaka Pelajar,
2003.
Text.