Perkin, Harold
Routledge, 1996
Buku Teks
Thompson, Heather McAfee McCune, author
Heather McAfee, 2006
Buku Teks
Marcy Rockman, Joe Flatman, editor
[Springer, Springer], 2012
eBooks
Kumar, Krishan, author
Blackwell, 1996
Buku Teks
Keller, Suzanne, author
Random House, 1968
Buku Teks