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Gaya APA
Friedman, T, L., Mandelbaum, M.(2011).That Used to be US : How America fell Behind in The World it Invented and How We can Come Back (1).Amerika:D&M Publishers, Inc.
Gaya MLA
Friedman, Thomas, L.., Mandelbaum, Michael."That Used to be US : How America fell Behind in The World it Invented and How We can Come Back".1Amerika:D&M Publishers, Inc,2011.Text.