APA

Campbell C., Gude K. & Duckworth M. (2006). Matrix. Pre-Intermediate Teacher's Book. : Oxford University Press.

Chicago

Campbell C, Gude K and Duckworth M. 2006. Matrix. Pre-Intermediate Teacher's Book. : Oxford University Press.

Harvard

Campbell C., Gude K. and Duckworth M. (2006). Matrix. Pre-Intermediate Teacher's Book. : Oxford University Press.

MLA

Campbell C, Gude K and Duckworth M. Matrix. Pre-Intermediate Teacher's Book. : Oxford University Press. 2006.