Gaya APA
Riyanto, S.
(2004).
2500 Key Words : to be good at english with useful examples
.
Yogyakarta:
Pustaka Pelajar.
Gaya MLA
Riyanto, Slamet.
"2500 Key Words : to be good at english with useful examples".
Yogyakarta:
Pustaka Pelajar,
2004.
Text.