APA (7th ed.) Citation

Obee, B. (2001). The grammar activity book. Cambridge University Press.

Chicago Style (17th ed.) Citation

Obee, Bob. The Grammar Activity Book. New York: Cambridge University Press, 2001.

MLA (9th ed.) Citation

Obee, Bob. The Grammar Activity Book. Cambridge University Press, 2001.

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