Gaya APA
Collie, J., Doff, A.
(2005).
Speaking 1: Student's Book
.
Yogyakarta:
Penerbit Kanisius.
Gaya MLA
Collie, Joanne., Doff, Adrian.
"Speaking 1: Student's Book".
Yogyakarta:
Penerbit Kanisius,
2005.
Book.