Bonvillain, Nancy, author
Prentice-Hall, 2003
Buku Teks
Schiffman, Harold F., author
Routledge, 1996
Buku Teks
Chaudenson, Robert, author
Routledge, 2001
Buku Teks
Raud, Rein, author
UK Malden, MA Polity Press, 2016
Buku Teks
edited by Alessandro Duranti
Blaxkwell , 2004
Buku Teks