APA引文

U.S. Bureau of the Census. (1921). Census of manufacturers: 1921. Govt. Print. Off.

芝加哥风格引文

U.S. Bureau of the Census. Census of Manufacturers: 1921. Washington: Govt. Print. Off, 1921.

MLA引文

U.S. Bureau of the Census. Census of Manufacturers: 1921. Govt. Print. Off, 1921.

警告：这些引文格式不一定是100％准确.