Gaya APA
Riyanto, S.
(2008).
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,
2008.
Buku Tex.