National Archieves and Records Service, G. S. A. (1976). Federal population censuses 1790-1890: A catalog of microfilm copies of the schedules.
Chicago-Zitierstil (17. Ausg.)National Archieves and Records Service, General Services Administration. Federal Population Censuses 1790-1890: A Catalog of Microfilm Copies of the Schedules. Washoington, 1976.
MLA-Zitierstil (8. Ausg.)National Archieves and Records Service, General Services Administration. Federal Population Censuses 1790-1890: A Catalog of Microfilm Copies of the Schedules. 1976.
警告：这些引文格式不一定是100％准确.