Velie, Lester
Labor U.S.A. / Lester Velie
Harper Brother, 1959
Buku Teks
Velie, Lester
Labor USA today / Lester Velie
N.Y. Harper & Row , 1964
Buku Teks
InfoUSA : information USA
US. Department of State, 2005
Multimedia
InfoUSA : information USA
US. Department of State, 2005
Multimedia
Finegan, Edward
Language in the USA: themes for the twenty-first century
Cambridge University Press, 2006
Buku Teks