APA (7th ed.) Citation

Klein, A. M., & Popham, E. A. (2011). The letters. University of Toronto Press.

Chicago Style (17th ed.) Citation

Klein, A. M., and Elizabeth A. Popham. The Letters. Toronto [Ont.]: University of Toronto Press, 2011.

MLA (8th ed.) Citation

Klein, A. M., and Elizabeth A. Popham. The Letters. University of Toronto Press, 2011.