APA (7th ed.) Citation

Simpson, C. (1973). The Lusitania ([1st American ed.].). Little, Brown.

Chicago Style (17th ed.) Citation

Simpson, Colin. The Lusitania. [1st American ed.]. Boston: Little, Brown, 1973.

MLA (9th ed.) Citation

Simpson, Colin. The Lusitania. [1st American ed.]. Little, Brown, 1973.