Please Help! Looking for lists.

Hi, I'm an intern with Hix Photo in Austin, TX and I'm supposed to be finding lists of the top Hispanic ad agencies in North America, Mexico, Latin America, and South America. I'm having much more trouble than I thought I would finding lists for those other than North America. If anyone can help me with this at all please contact me and it would be greatly appreciated.

Thank you,

Brenden Freedman
Hix Photo
Brendenfreedman@hotmail.com
AIM: brendenflg