Petrescu, N. (1924). The principles of comparative sociology. Watts & Co..
芝加哥风格引文Petrescu, Nicolae. The Principles of Comparative Sociology. London: Watts & Co., 1924.
MLA引文Petrescu, Nicolae. The Principles of Comparative Sociology. Watts & Co., 1924.
警告：这些引文格式不一定是100％准确.