1. Magazine publisher's subscriber list
2. List brokers
3. List compliers
4. Associations (check out these great directories: National Trade and Professional Associations of the United States, from Columbi Books (888-265-0600), and The Encyclopedia of Associations by The Gale Group (800 877-GALE)
5. Trade show attendees (for schedules check out www.TSCentral.com and www.tradeshowdataweek.com)
6. Catalog houses
7. Catalogs of mailing lists
8. CD-ROMs
9. Internet
10. Your competitors
11. List reference directories: (including SRDS List Source, (800) 851-SRDS)
12. ... and the BEST? Your house list!
