Cita APA (7a ed.)

DeFilippo, J., & Mackey, D. (1987). Grammar plus: A basic skills course for english language learners. Addison-Wesley Publ.Comp.

Cita Chicago Style (17a ed.)

DeFilippo, Judy, y Daphne Mackey. Grammar Plus: A Basic Skills Course for English Language Learners. Addison-Wesley Publ.Comp, 1987.

Cita MLA (8a ed.)

DeFilippo, Judy, y Daphne Mackey. Grammar Plus: A Basic Skills Course for English Language Learners. Addison-Wesley Publ.Comp, 1987.