Almost every publication, journal or conference series seems to have its own style guide. Is anyone keeping track of these ? IE, is there a website which keeps a list of style guides - specifically citation styles - for various publications ? The most definitive (ie all-encompassing) list would be what I'm after.
This Wikipedia may be a good starting point.
There are the international ISO series. And just in the US there are style guides for general writing, legal documents, academic papers, journalism, electronic publishing, business, and computer industry. It may be better to limit your scope of study.