1. A. Syguła, Smartfon, Smartphone as a tool in the education process in higher education - possibilities and prospects of application (in polish). Online at: http://www.e-edukacja.net/dziewiata/referaty/Sesja_2b_1.pdf.
2. *** http://androidpolska.pl/kategoria/android_aplikacje/104.
3. *** http://shop.lenovo.com/us/en/tablets/lenovo/yoga-tablet-series/.
4. *** http://beta.appinventor.mit.edu.
5. *** http://beta.appinventor.mit.edu/learn/setup/.