APA (7th ed.) Citation

Williams, H. S., & Williams, E. H. (1915). Modern warfare. Grant Richards.

Chicago Style (17th ed.) Citation

Williams, Henry Smith, and Edward Huntington Williams. Modern Warfare. London: Grant Richards, 1915.

MLA (8th ed.) Citation

Williams, Henry Smith, and Edward Huntington Williams. Modern Warfare. Grant Richards, 1915.