Gaya APA

Alexander, L., Alexander, L. (). New Concept English: Developing Skills Supplementary Written Exercises (Cet. 13). Yogyakarta: Kanisius; Longman.

Gaya MLA

Alexander, L.G.., Alexander, L.G.. "New Concept English: Developing Skills Supplementary Written Exercises". Cet. 13 Yogyakarta: Kanisius; Longman, . Text.