APA
Irwin G. W., . (1970). Harper Encyclopedia of the Modern World : A Concise Reference History from 1760 to the Present. New York ; Evanston, IL ; London: Harper & Row.
Chicago
Irwin Graham W, . 1970. Harper Encyclopedia of the Modern World : A Concise Reference History from 1760 to the Present. New York ; Evanston, IL ; London: Harper & Row.
Harvard
Irwin G. W., . (1970). Harper Encyclopedia of the Modern World : A Concise Reference History from 1760 to the Present. New York ; Evanston, IL ; London: Harper & Row.
MLA
Irwin Graham W, . Harper Encyclopedia of the Modern World : A Concise Reference History from 1760 to the Present. New York ; Evanston, IL ; London: Harper & Row. 1970.
