Gaya APA
Walidi, .
(2006).
Step by step to speak English
(
Cet.1)
.
Yogyakarta:
Citra aji parama.
Gaya MLA
Walidi, .
"Step by step to speak English".
Cet.1
Yogyakarta:
Citra aji parama,
2006.
Text.