APA

Pick F. W., . (1949). Contemporary history. [Oxford]: Pen-in-Hand.

Chicago

Pick Frederick Walter, . 1949. Contemporary history. [Oxford]: Pen-in-Hand.

Harvard

Pick F. W., . (1949). Contemporary history. [Oxford]: Pen-in-Hand.

MLA

Pick Frederick Walter, . Contemporary history. [Oxford]: Pen-in-Hand. 1949.