ESP 8266 Home automation using Alexa app . No need Alexa device. - YouTube
IOT – Google, Amazon Alexa, Signal Jammer, ESP 8266 NodeMCU and Location Tracker etc..,: New model technology development - Kindle edition by k, Anbazhagan, k, Ambika parameswari. Children Kindle eBooks @ Amazon.com.
Alexa Home Automation using ESP8266 - IotCircuitHub