Reference works are an excellent first stop in your research and are incredibly useful for the following:
ASHA is a good source for information on various topics and conditions.
ASHA's Practice Portal offers one-stop access to resources to guide evidence-based decision-making on clinical and professional issues.
ASHA Compendium of EBP Guidelines and Systematic Reviews
ASHA Preferred Practice Patterns for the Profession of Speech-Language Pathology