APA

Williamson S. R., Samuel R. Williamson, .Austria-Hungary and the origins of the First World War. New York: .

Chicago

Williamson Samuel R, Samuel R. Williamson, .Austria-Hungary and the origins of the First World War. New York: .

Harvard

Williamson S. R., Samuel R. Williamson, .Austria-Hungary and the origins of the First World War. New York: .

MLA

Williamson Samuel R, Samuel R. Williamson, .New York: . .