ProveIt is a user script (and gadget) that makes it easy to find, edit, add, and cite references in Wikipedia articles.
It provides a graphical interface for editing, adding, and citing references. The ProveIt toolbar displays at the bottom of the Wikipedia text editor (for articles only).
Whether 'tis nobler in the mind to suffer The slings and arrows of outrageous fortune, Or to take arms against a sea of troubles, And by opposing end them?