- Amazon heads toward $700 billion valuation thanks to Alexa, AWS and tax gainsMarketWatch
- Amazon.com’s (AMZN) on Q4 2017 Results – Earnings Call TranscriptSeeking Alpha
- Amazon Will Hunker Down on Food and Alexa in 2018TheStreet.com
- SEC FORM 4 – SEC.govSEC.gov
- UPDATE 5-Amazon posts largest profit in its history on sales, tax boostReuters