1. 2014. Amazon.com: Alexa.https://www.amazon.com/b?node=21576558011. 2014. Amazon.com: Alexa.https://www.amazon.com/b?node=21576558011.
2. 2016. Google Assistant your own personal Google.https://assistant.google.com. 2016. Google Assistant your own personal Google.https://assistant.google.com.
3. 2017. Alexa Simulator limitations. https://developer.amazon.com/en-US/docs/alexa/devconsole/test-your-skill.html##use-simulator. 2017. Alexa Simulator limitations. https://developer.amazon.com/en-US/docs/alexa/devconsole/test-your-skill.html##use-simulator.
4. 2017. Amazon.com: Alexa Skills. https://www.amazon.com/s?i=alexa-skills. 2017. Amazon.com: Alexa Skills. https://www.amazon.com/s?i=alexa-skills.
5. 2018. Portland Family Says Their Amazon Alexa Recorded Private Conversations.https://www.wweek.com/news/2018/05/26/portland-family-says-their-amazon-alexa-recorded-private-conversations-and-sent-them-to-a-random-contact-in-seattle/. 2018. Portland Family Says Their Amazon Alexa Recorded Private Conversations.https://www.wweek.com/news/2018/05/26/portland-family-says-their-amazon-alexa-recorded-private-conversations-and-sent-them-to-a-random-contact-in-seattle/.