1. British Library of Sounds. http://sounds.bl.uk/. British Library of Sounds. http://sounds.bl.uk/.
2. Monsoon Power Monitor. http://www.msoon.com/LabEquipment/PowerMonitor/. Monsoon Power Monitor. http://www.msoon.com/LabEquipment/PowerMonitor/.
3. Free Sound Effects. http://www.freesfx.co.uk/. Free Sound Effects. http://www.freesfx.co.uk/.
4. Google Nexus 5. https://www.google.com/nexus/5/. Google Nexus 5. https://www.google.com/nexus/5/.
5. HTK Speech Recognition Toolkit. http://htk.eng.cam.ac.uk/. HTK Speech Recognition Toolkit. http://htk.eng.cam.ac.uk/.