APA (7th ed.) Citation

Byrd, D. R. H., & Mortimer, J. A. (1987). Extensions two: Communicative activities for intermediate students of English. Prentice Hall Regents.

Chicago Style (17th ed.) Citation

Byrd, Donald R. H., and Jason A. Mortimer. Extensions Two: Communicative Activities for Intermediate Students of English. Englewood Cliffs, NJ: Prentice Hall Regents, 1987.

MLA (9th ed.) Citation

Byrd, Donald R. H., and Jason A. Mortimer. Extensions Two: Communicative Activities for Intermediate Students of English. Prentice Hall Regents, 1987.