"TED Talks". Spreadsheets.Google.com. December 4, 2014. Archived from the original(Google Sheets) on July 12, 2012. Retrieved December 7, 2014 – via On.TED.com.
"TED Talks". Spreadsheets.Google.com. December 4, 2014. Archived from the original(Google Sheets) on July 12, 2012. Retrieved December 7, 2014 – via On.TED.com.