APA (7th ed.) Citation

McWilliams, J. L., & Steel, R. (1985). Gas!: The battle for Ypres, 1915. Vanwell.

Chicago Style (17th ed.) Citation

McWilliams, James L., and R. Steel. Gas!: The Battle for Ypres, 1915. St. Catharines, Ontario: Vanwell, 1985.

MLA (9th ed.) Citation

McWilliams, James L., and R. Steel. Gas!: The Battle for Ypres, 1915. Vanwell, 1985.