1. Mobile operating system market share worldwide.
http://gs.statcounter.com/os-market-share/mobile/worldwide
. Accessed 06 Aug 2019
2. Global mobile OS market share in sales to end users from 1st quarter 2009 to 2nd quarter 2018.
https://www.statista.com/statistics/266136/global-market-share-held-by-smartphone-operating-systems/
. Accessed 06 Aug 2019
3. Number of available applications in the Google Play Store from December 2009 to December 2018.
https://www.statista.com/statistics/266210/number-of-available-applications-in-the-google-play-store/
. Accessed 06 Aug 2019
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