The Mobile App Market will be Worth $27 Billion in 2013 as Tablet Revenue Grows. www.abiresearch.com [online]. [cit. 2019-03-26]. Dostupné online. (anglicky)
Apple’s App Store and Google Play Users Spent over $83 Billion on Mobile Apps in the Last 12 Months, Globally [online]. [cit. 2020-01-23]. Dostupné online.