Currier, Glenn
Harcourt, college Pub., 1997
Buku Teks
Bassis, Michael S.
McGraw-Hill, 1991
Buku Teks
Gelles, Richard J.
McGraw-Hill College , 1999
Buku Teks
Giddens, Anthony
W.W. Norton & Compan, 2005
Buku Teks
Gillin, John Lewis
Macmillan, 1942
Buku Teks