ŽÁK, Štefan. The Identification of innovative research methods and techniques utilized in marketing research in digital era. In Studia commercialia Bratislavensia : scientific journal of Faculty of Commerce, University of Economics in Bratislava. - Bratislava : Obchodná fakulta Ekonomickej univerzity v Bratislave, 2015. ISSN 1337-7493, 2015, roč. 8, č. 29, s. 139-152.