Gaya APA

Slater, J, C, D, S., Doff, A. (1991). SPEAKING : Student's Book . Yogyakarta: Kanisius.

Gaya MLA

Slater, Joanne, Collie, Dan, Stephen., Doff, Andrian. "SPEAKING : Student's Book". Yogyakarta: Kanisius, 1991. Text.