APA

Campbell C., Gude K. & Duckworth M. (2002). Matrix. Pre-Intermediate. New York: Oxford University Press.

Chicago

Campbell C, Gude K and Duckworth M. 2002. Matrix. Pre-Intermediate. New York: Oxford University Press.

Harvard

Campbell C., Gude K. and Duckworth M. (2002). Matrix. Pre-Intermediate. New York: Oxford University Press.

MLA

Campbell C, Gude K and Duckworth M. Matrix. Pre-Intermediate. New York: Oxford University Press. 2002.