Gaya APA

Alexander, L. (2016). Practice and Progress : an integrated course for pre-intermediate students (New Concept English) (Edisi 1). Kabupaten Sleman: PT. Kanisius.

Gaya MLA

Alexander, L.G.. "Practice and Progress : an integrated course for pre-intermediate students (New Concept English)". Edisi 1 Kabupaten Sleman: PT. Kanisius, 2016. TEXT.