APA (7th ed.) Citation

DeFilippo, J., & Mackey, D. (1976). Grammar plus workbook: A basic skills course for english language learners. Addison-Wesley Publ.Comp.

Chicago Style (17th ed.) Citation

DeFilippo, Judy, and Daphne Mackey. Grammar Plus Workbook: A Basic Skills Course for English Language Learners. Addison-Wesley Publ.Comp, 1976.

MLA (8th ed.) Citation

DeFilippo, Judy, and Daphne Mackey. Grammar Plus Workbook: A Basic Skills Course for English Language Learners. Addison-Wesley Publ.Comp, 1976.

Warning: These citations may not always be 100% accurate.