Willets, G. (1899). Rulers of the world at home: How they look and how they live. Christian Herald.
芝加哥风格引文Willets, Gilson. Rulers of the World at Home: How They Look and How They Live. New York: Christian Herald, 1899.
MLA引文Willets, Gilson. Rulers of the World at Home: How They Look and How They Live. Christian Herald, 1899.
警告：这些引文格式不一定是100％准确.