Pesic, Peter
MIT Press, 2000
Buku Teks
edited by Robert E. Goodin, Charles Tilly
Oxford University Press, 2008
Buku Referensi
Denscombe, Martyn
Open University Press, 2012
Buku Teks
Sommer, Robert
Oxford University Press, 2001
Buku Teks
Tu, Anthony T., 1930-
John Wiley & Sons, 1982
Buku Teks