APA-Zitierstil (7. Ausg.)

(1974). Census tracts, 1970, Washington urban area, D.C., MD, and VA. U.S. Geological Survey.

Chicago-Zitierstil (17. Ausg.)

Census Tracts, 1970, Washington Urban Area, D.C., MD, and VA. Washington, D.C: U.S. Geological Survey, 1974.

MLA-Zitierstil (9. Ausg.)

Census Tracts, 1970, Washington Urban Area, D.C., MD, and VA. U.S. Geological Survey, 1974.