Citing treaties and international agreements

Feature requests
1

Would it be possible to add a reference category for treaties and other international law?

Some examples:

http://blog.apastyle.org/apastyle/2013/09/citing-treaties-and-other-international-agreements.html

References herein: http://www.bioone.org/doi/abs/10.3417/2012004

2

We are actually in the process of preparing a major update with new reference categories. We will definitely have a look how that can be fit in our data model. @andreas in our team is responsible for this update. He can provide more details but he is away for a week.