Use library resources and Google Scholar to find scholarly sources for your Speech to Inquire/Reinforce and Speech to a Hostile Audience.
Tip #1: Search individual databases to find research within a certain discipline or field. Look through the Databases A-Z List, and change the subject to whatever discipline would be most applicable to your research topic.
Tip #2: Take time to brainstorm keywords & related terms to get the best search results.
Tip #3: Limit your search results to Scholarly (Peer-Reviewed) Journals to ensure you're finding scholarly research.