1. Alexa Certification Tests for VUI and UX. https://developer.amazon.com/fr-FR/docs/alexa/custom-skills/voice-interface-and-user-experience-testing-for-a-custom-skill.html.
2. Alexa Permissions. https://developer.amazon.com/en-US/docs/alexa/custom-skills/configure-permissions-for-customer-information-in-your-skill.html.
3. Alexa Policy for Child-Directed skill. https://developer.amazon.com/fr-FR/docs/ alexa/custom-skills/policy-testing-for-an-alexa-skill.html#cert-child-directed.
4. Alexa Policy for Health skill. https://developer.amazon.com/fr-FR/docs/alexa/ custom-skills/policy-testing-for-an-alexa-skill.html#3-health.
5. Alexa Skill Counts Surpass 80K in US. https://voicebot.ai/2021/01/14/alexa-skill-counts-surpass-80k-in-us-spain-adds-the-most-skills-new-skill-introduction-rate-continues-to-fall-across-countries.