APA (7th ed.) Citation

DeFilippo & Mackey. (1994). Grammar Plus: A basic skills course for English language learners (2nd ed.). Addison-Wesley.

Chicago Style (17th ed.) Citation

DeFilippo and Mackey. Grammar Plus: A Basic Skills Course for English Language Learners. 2nd ed. New York: Addison-Wesley, 1994.

MLA (8th ed.) Citation

DeFilippo and Mackey. Grammar Plus: A Basic Skills Course for English Language Learners. 2nd ed. Addison-Wesley, 1994.