Cassen, R.H.
Macmillan, 1982
Buku Teks
Weber, Max, 1864-1920, author
University of California press, 1978
Buku Teks SO
edited by Allan Cochrane, Chris Hamnett and Linda McDowell
Harper and Row, 1981
Buku Teks
Weber, Max, 1864-1920, author
Berkeley University of California Press, 1978
Buku Teks
Lewis, David, author
Cambridge University Press, 2011
Buku Teks SO