Gaya APA
Agustin, R., Hastuti, E.
(2008).
Let's Understand English
(
Cet; 1)
.
Surakarta:
Era pustaka utama.
Gaya MLA
Agustin, Reni., Hastuti, Eni.
"Let's Understand English".
Cet; 1
Surakarta:
Era pustaka utama,
2008.
Abdul Gaffar.