Swan, Terry, author
Guardian Books, 2006
Buku Teks
Morgan, Clifford T., author
McGraw-Hill, 1974
Buku Teks
Ouellette, Robert J., author
Prentice-Hall, 1994
Buku Teks
Giddens, Anthony, author
Harcourt, Brace Javanovich, 1982
Buku Teks
Schaefer, Richard T, author
McGraw-Hill, 2011
Buku Teks