APA

Riker T. W., . (1949). A history of modern Europe. New York: Knopf.

Chicago

Riker Thad Weed, . 1949. A history of modern Europe. New York: Knopf.

Harvard

Riker T. W., . (1949). A history of modern Europe. New York: Knopf.

MLA

Riker Thad Weed, . A history of modern Europe. New York: Knopf. 1949.