Gaya APA
Riyanto,Slamet, .
(2002).
The easy way to master english in a few days
(
Cet.I)
.
:
Pustaka Pelajar.
Gaya MLA
Riyanto,Slamet, .
"The easy way to master english in a few days".
Cet.I
:
Pustaka Pelajar,
2002.
Referensi.