1. Amazon echo - what we know now (updated). http://files.constantcontact.com/150f9af2201/70c07fdd-a197-4505-9476-e83aa726f025.pdf. Amazon echo - what we know now (updated). http://files.constantcontact.com/150f9af2201/70c07fdd-a197-4505-9476-e83aa726f025.pdf.
2. Atooma. https://www.atooma.com/. Atooma. https://www.atooma.com/.
3. Google APIs. https://console.developers.google.com/. Google APIs. https://console.developers.google.com/.
4. IFTTT. https://ifttt.com/. IFTTT. https://ifttt.com/.
5. IFTTT API(2017). https://platform.ifttt.com/docs/api_reference. IFTTT API(2017). https://platform.ifttt.com/docs/api_reference.