Where can teachers find authoritative and research-based resources to support their practice when they have questions about teaching students with autism?

There is a website from the National Professional Development Center on Autism Spectrum Disorder (opens in a new window). The purpose of that center is to provide evidence-based practices for classroom settings, not for clinical settings. And there are more than 20 evidence-based practices (opens in a new window) on the website, where teachers can find the research behind it as well as information about how to actually implement the practices.