Fulcher, James, author
Oxford University Press, 2007
Buku Teks
Lapiere, Richard T., author
McGraw-Hill, 1946
Buku Teks
Andersen, Margaret L., author
Thomson, Wadsworth, 2009
Buku Teks
Giddens, Anthony, author
W.W. Norton & Compan, 2005
Buku Teks
Hughes, Michael, author
McGraw-Hill, Higher Education, 2009
Buku Teks