Gaya APA

Alexander, L.G.. (1991). New Concept English Practice and Progress (ed.7). Yogyakarta: Kanisius.

Gaya Chicago

Alexander, L.G.. New Concept English Practice and Progress. ed.7 Yogyakarta: Kanisius, 1991. .

Gaya MLA

Alexander, L.G.. New Concept English Practice and Progress. ed.7 Yogyakarta: Kanisius, 1991. .

Gaya Turabian

Alexander, L.G.. New Concept English Practice and Progress. ed.7 Yogyakarta: Kanisius, 1991. .