APA

Kohn H., . (19501949). The twentieth century: a mid-way account of the Western World. New York: Macmillan Co.

Chicago

Kohn Hans, . 19501949. The twentieth century: a mid-way account of the Western World. New York: Macmillan Co.

Harvard

Kohn H., . (19501949). The twentieth century: a mid-way account of the Western World. New York: Macmillan Co.

MLA

Kohn Hans, . The twentieth century: a mid-way account of the Western World. New York: Macmillan Co. 19501949.