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2. Deloitte (2016). Media consumption in Russia. Key trends. Moscow: Deloitte CIS Research Center. https://www2.deloitte.com/content/dam/Deloitte/ru/Documents/technology-media-telecommunications/ru_media_consumption_in_Russia_2015_ru.pdf
3. Deloitte (2017). Media consumption in Russia. Growth of media consumption during large sports events. Moscow: Deloitte CIS Research Center. https://www2.deloitte.com/content/dam/Deloitte/ru/Documents/technology-media-telecommunications/russian/media-consumption-in-Russia-2017-rus.pdf
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5. VCIOM (2019). The opinions of specialists working in companies that use messages to inform clients about the substitutability of different channels for informing clients. Report (with enclosed letter by VCIOM from 03.04.2019 No. 39). (In Russian).