Services, U. S. D. o. S. O. o. M. (1975). Countries of the world and their leaders. Detroit : Gale Research Co..
芝加哥风格引文Services, United States. Dept. of State. Office of Media. Countries of the World and Their Leaders. Detroit : Gale Research Co., 1975.
MLA引文Services, United States. Dept. of State. Office of Media. Countries of the World and Their Leaders. Detroit : Gale Research Co., 1975.
警告：这些引文格式不一定是100％准确.