Gale Group. (2008). Gale encyclopedia of world history: Governments. Gale.
芝加哥风格引文Gale Group. Gale Encyclopedia of World History: Governments. Detroit, Mich: Gale, 2008.
MLA引文Gale Group. Gale Encyclopedia of World History: Governments. Gale, 2008.
警告：这些引文格式不一定是100％准确.