Gaya APA

ALEXANDER, L. (1999). First things first: students' book an integrated course for beginners / L.G. Alexander (Cet.19). : Kanisius.

Gaya MLA

ALEXANDER, L.G.. "First things first: students' book an integrated course for beginners / L.G. Alexander". Cet.19 : Kanisius, 1999. Referensi.