National Organizations
American Association for School Librarians (AASL)
This professional website is under the umbrella of the American Library Association. Membership includes discounts to conferences, a subscription to Knowledge Quest, a 10% discount on all AASL publications and access to various other tools. One of the tabs on the AASL website is a link to professional tools. This includes access to toolkits and resource guides listed alphabetically. Membership is not required to search the toolkits and resource guides.
Young Adult Library Services Association (YALSA)
Mainly geared towards public libraries that serve young adults, this website has many useful tips on those who are interested in working with teens. It offers access to professional development topics that might help the slms understand the young adolescent. It's best use for a slms is the list of books for young adults.
American Library Association (ALA)
One cannot be a librarian without belonging to ALA. It is self-explanatory.
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