Hartley, W. H., & Vincent, W. S. (1970). American civics (3rd ed.). Harcourt brace jovanovich.
Chicago-čujuhus (17. p.)Hartley, William H., juo William S. Vincent. American Civics. 3rd ed. New York: Harcourt brace jovanovich, 1970.
MLA-čujuhus (9. p.)Hartley, William H., juo William S. Vincent. American Civics. 3rd ed. Harcourt brace jovanovich, 1970.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.