6
Published 1932
Book
8
by Schmitz-Berning, Cornelia
Published 2000
Book
9
Published 1998
Book
10
by Mertens, Bernd, 1967-
Published 2009
Book
11
by Wildt, Michael, 1954-
Published 2008
Book
13
Published 2007
Book
15
Published 1985
Book
17
Published 2014
Book