Gaya APA
Collie,Joanne, ., Doff, A.
().
Speaking 4: Student's Book
.
Yogyakarta:
Penerbit Kanisius.
Gaya MLA
Collie,Joanne, ., Doff, Adrian.
"Speaking 4: Student's Book".
Yogyakarta:
Penerbit Kanisius,
.
Book.