I have 3a/3b hair....I do this quite a lot. I first take the front section of my hair and use a barrette like the ones on the left in this link:
EyeCandy - Category Browse: HAIR ACCESSORIES
Using it to anchor that front top part of my hair into the poof. Then just gather up all of your hair and do a pony. Sometimes the pony will go higher than the barrette, sometimes right below...just ignore that it's there. I couldn't live without those little boogers! Use 99% of the time! I'll try to find a good pic if it helps.