Peters, J., author
ITS, [date of publication not identified]
Buku Teks
William Jeynes
Springer, 2012
eBooks
Weber, Max, 1864-1920, author
Routledge Classics , 2001
Buku Teks
Amsterdam : L.C.C. Malmberg, 'Shertogenbosch
Majalah, Jurnal, Buletin
Samengesteld door Herman Pijfers
Arbor, 1993
Buku Teks