BURY,Christopher, POTTER, M., & WINTER, M. (1988). Student practice book 4: Video english. Macmillan Pub.
Lua i Stíl Chicago (17ú heag.)BURY,Christopher, Mike POTTER, agus Michael WINTER. Student Practice Book 4: Video English. London: Macmillan Pub, 1988.
Lua MLA (9ú heag.)BURY,Christopher, et al. Student Practice Book 4: Video English. Macmillan Pub, 1988.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.