| Business | Phone |
| Interviewing Service-America 15400 Sherman Way # 400, Van Nuys 91406 | (818) 989-1044 |
| Nahmias Research Svc Inc 7625 Hayvenhurst Ave # 28, Van Nuys 91406 | (818) 778-1070 |
| Brennan Information Group Inc Van Nuys 91406 | (818) 817-7767 |
| Shulman Research 6621 Mclennan Ave, Van Nuys 91406 | (818) 782-4252 |