Mastering the AWS SDK for PHP (TLS306) | AWS re:Invent 2013
Alexa Skills für Amazon Echo mit PHP entwickeln - Ralf Eggert | IPC 2017 - YouTube
Free Online Course: Introduction to Voice Design with Amazon's Alexa from Udemy | Class Central
Different between echo and print in php. - DevOpsSchool.com
Clean Code in PHP: Expert tips and best practices to write beautiful, human-friendly, and maintainable PHP: Windler, Carsten, Daubois, Alexandre: 9781804613870: Amazon.com: Books
Sean Breeden - Full Stack PHP Developer - Things to ask your Amazon Echo