| American Library Association | Trade organization supports libraries in U.S. |
| Public Library Assn. | Resources and support for public librarians. |
| ACRL | Resources and support for academic librarians. |
| Canadian Lib. Assn. | Trade organization for Canadian libraries. |
| Assn. of Law Libs. | Resources and support for law librarians. |
| Medical Lib. Assn. | Resources and support for medical librarians. |
| Assn. for Rsch. Libs. | Information for research academic librarians. |
| Special Libraries Assn. | Resources for special librarians. |
| Professional Orgs... | Comprehensive list of professional assns. |