Cita APA

Williamson, S. R. (1991). Austria-Hungary options for war. The outbreak of World War I.

Citación estilo Chicago

Williamson, Samuel R. "Austria-Hungary Options for War." The Outbreak of World War I 1991.

Cita MLA

Williamson, Samuel R. "Austria-Hungary Options for War." The Outbreak of World War I, 1991.