Go to artofthebow.com and you can probably sneak a peak at how Francios Rabbath holds his.
__________________ "All that remains of communities and civilizations, all that remains of their worth and dignity exists in the art they leave."
William Carlos Williams
Check up these taken from a Jeff Bradetich video (if you're interested in classical technique, you should get his videos and books, they are quite complete and instructing). Here and here.
Hope this helps.
Scroll down the page to find the bass-specific info.
Good description and pictures from many angles.
Note: I originally found this page while browsing at Bob Gollihur's double bass links page. If you don't know about this great resource already then see what you're missing at:http://www.urbbob.com/basslink.html
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The older I get, The better I was.
I got just a copy of the art of the bow and I have to say it's fantastic. It covers everything from the basics of holding the bass to the finer points of the bow. Also included are interviews with Rabbath on his philosophy on teaching and practicing. Well worth the money I spent on it.