Barber, J. (2000). Presidents (1st American ed.). Dorling Kindersley Pub..
Lua i Stíl Chicago (17ú heag.)Barber, James. Presidents. 1st American ed. New York: Dorling Kindersley Pub., 2000.
Lua MLA (8ú heag.)Barber, James. Presidents. 1st American ed. Dorling Kindersley Pub., 2000.
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