Answered By: Leslie Burmeister
Last Updated: Dec 23, 2015     Views: 1295

Agency lists:

Advertising Red Books - Agencies
Check Harvard availability
Ref. HF5805 .A226 in Stamps Reading Room
Profiles national and international advertising agencies and public relations firms.

Agency Rankings:

Vault.com - List of Best Advertising Agencies
Ad Age - Agency Report  
Adbrands.net Ranking of agencies by revenues.