APA
(1980). Countries of the World and their leaders yearbook. Detroit, Mich: Gale Research Co.
Chicago
1980. Countries of the World and their leaders yearbook. Detroit, Mich: Gale Research Co.
Harvard
(1980). Countries of the World and their leaders yearbook. Detroit, Mich: Gale Research Co.
MLA
Countries of the World and their leaders yearbook. Detroit, Mich: Gale Research Co. 1980.