APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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

Warning: These citations may not always be 100% accurate.