APA引文

Engels, F. (1972). The origin of the family, private property, and the state. International Publishers.

芝加哥风格引文

Engels, Frederick. The Origin of the Family, Private Property, and the State. New York: International Publishers, 1972.

MLA引文

Engels, Frederick. The Origin of the Family, Private Property, and the State. International Publishers, 1972.

警告:这些引文格式不一定是100%准确.