Atshaya S., Rungta S., 2016. Digital Marketing vs Internet Marketing: A Detailed Study, "International Journal of Novel Research in Marketing Management and Economics" 3, 1, 29-33.

Baltes L., 2016. Digital marketing mix specific to the IT Field, "Bulletin of Transilvania University of Brasov", Series V: Economic Sciences 9(58), 1.

Bhargava M. 2015. Up keeping with the new era of the digital world: Digital Marketing & Prospects, "Indian Streams Research Journal" 1, 4(12), 7-9

Chaffey D., 2011. E-business & e-commerce management, Pearson Education, Edinburgh Gate, England.

Cibro P. A., 2016. The implementation of Integrated Digital Marketing in order to enhance the Brand Awareness of WIMB Czech Republic, Tomas Bata University in Zlin, Zlin.

Dryer R.L., 2010. Advising Your Clients (and You!) in the New World of Social Media: What Every Lawyer Should Know About Twitter, Facebook, Youtube, & Wikis, "Utah Bar Journal" 3(23), 16-21.

Ellet W., 2007. The case study handbook. How to read, discuss and write persuasively about cases, Harvard Business School Press, Boston, Massachusetts.

Hanna R., Rohm A., Crittenden V., 2011. We're all connected: The power of the social media ecosystem, "Business Horizons" 54, 3, 265-273.

Khan F, Siddiqui K., 2019. The importance of digital marketing. An exploratory study to find the perception and effectiveness of digital marketing amongst the marketing professionals in Pakistan, "Journal of Information Systems & Operations Management" 7(2).

Kotler P., Armstrong G., 2010. Principles of marketing. 13th global edition, University of North Carolina, Pearson, New Jersey. NARKINIEMI J., 2013. Using Digital Marketing to Develop a Modern Marketing Strategy for a Startup Case Study: Design With Benefits, Helsinki Metropolia University of Applied Sciences.

Nyst C., 2018. Children and Digital Marketing: Rights, risks and responsibilities. Discussion Paper, UNICEF Private Sector Engagement, Geneva.

Sathya P., 2015. A Study on Digital Marketing and its Impact, "International Journal of Science and Research (IJSR)", 866-868.

Savas E.S., 2005. Privatization in the City: Successes, Failures, Lessons, CQ Press, Washington, DC.

Stephen A.T., 2015. The role of digital and social media marketing in consumer behavior. "Current opinion in psychology", 10, 17-21

Yasmin A., Tasneem S., Fatema K., 2015. Effectiveness of Digital Marketing in the Challenging Age: An Empirical Study, "International Journal of Management Science and Business Administration" 1, 5, 69-80.

AMA, Definitions of Marketing, retrieved from https://www.ama.org/AboutAMA/Pages/Definition-of-Marketing.aspx [accessed: 20.02.2019]

Eteris E., 2018. Digital transformation in the EU: the Baltic States are catching up, retrieved from http://www.baltic-course.com/eng/good_for_business/?doc=140167 [accessed: 10.02.2019]

European Commission, 2018. How digital is your country? Europe needs Digital Single Market to boost its digital performance, retrieved from http://europa.eu/rapid/press-release_IP-18-3742_en.htm [accessed: 10.02.2019]

Lithuanian digital marketing firms' revenue and employment data, retrieved from https://rekvizitai.vz.lt/ [accessed: 22.02.2019]

Latvian digital marketing firms data, retrieved from https://clutch.co/lv/agencies/digitalmarketing [accessed: 22.02.2019]

Estonian digital marketing firms data, retrieved from https://clutch.co/ee/agencies/digital-marketing [accessed: 22.02.2019]

Estonian digital marketing firms' revenue and employment data, retrieved from https://www.teatmik.ee/et/personlegal/ [accessed: 22.02.2019]