Gaya APA
7 hari speaking emglish. (2013).
Yogyakarta:
Buku Pintar.
Gaya Chicago
7 hari speaking emglish.
.
Yogyakarta:
Buku Pintar,
2013.
Text.
Gaya MLA
7 hari speaking emglish.
.
Yogyakarta:
Buku Pintar,
2013.
Text.
Gaya Turabian
7 hari speaking emglish.
Yogyakarta:
Buku Pintar,
2013.
Print.