How to delete voice history from Amazon Alexa, Google Assistant, and Apple's Siri
What Is Alexa?
Amazon Echo, a.k.a. Alexa, Is a Personal Aide in Need of Schooling - The New York Times
Alexa: 2021 Complete User Guide for Your Amazon Echo Device. 100+1 Things to Ask Your Personal Assistant - Kindle edition by Candace, Hudson. Professional & Technical Kindle eBooks @ Amazon.com.
Amazon Alexa v Google Home: Pitting the voice assistants against each other