DeFilippo, J., & Mackey, D. (1987). Grammar plus: A basic skills course for english language learners. Addison-Wesley Publ.Comp.
Lua i Stíl Chicago (17ú heag.)DeFilippo, Judy, agus Daphne Mackey. Grammar Plus: A Basic Skills Course for English Language Learners. Addison-Wesley Publ.Comp, 1987.
Lua MLA (8ú heag.)DeFilippo, Judy, agus Daphne Mackey. Grammar Plus: A Basic Skills Course for English Language Learners. Addison-Wesley Publ.Comp, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.