APA (7th ed.) Citation

Gude, K., & Wldman, J. (2001). Matrix: Upper-intermediate student's book. Oxford University Press.

Chicago Style (17th ed.) Citation

Gude, Kathy, and Jayne Wldman. Matrix: Upper-intermediate Student's Book. Oxford: Oxford University Press, 2001.

MLA (9th ed.) Citation

Gude, Kathy, and Jayne Wldman. Matrix: Upper-intermediate Student's Book. Oxford University Press, 2001.