I have created a BiBTeX style sheet (.bst-file) which incorporates the citation style of the Department of Political Science at the University of Mannheim. It can be downloaded here. (Right-click and choose “save as”). In some cases LATEX will not recognize the file makebst.tex in your installation and produces an error when you use the style file. The easiest way to get around this problem is to download the file from the CTAN server and put it into your working directory.