APA (7th ed.) Citation

Olson, K. C., & Cohen, M. L. (2009). Principles of legal research. West.

Chicago Style (17th ed.) Citation

Olson, Kent C., and Morris L. Cohen. Principles of Legal Research. St. Paul, MN: West, 2009.

MLA (8th ed.) Citation

Olson, Kent C., and Morris L. Cohen. Principles of Legal Research. West, 2009.