Question development and bibliography

After consulting with Mr Stewart, I have formulated a rough question;

How Democratic was Periklean Democracy by 431 BC?

This means I will focus my essay on what the Athenian democracy was like by the time Pericles died. I have also updated my bibliography with all of the books I borrowed from the Barr Smith library.

Special study development.

Last weekend (2nd of May) i went to the Barr smith again, this time I borrowed books concerning Athenian democracy. This was a very successful search and I now have plenty of reading to do, however I have found out that the road to democracy was a long one, so I am thinking I need to cut down my topic to focus on a specific era. However, I don’t know what era to concentrate on.
Any thoughts?