Cetlová, Helena, Radek Marciník, and Emil Velinov. “Research into Online Marketing Activities and Tools for Measuring Their Efficiency by Entrepreneurs in the Czech Republic”. Socio-Economic and Humanities Studies 11, no. 1 (November 1, 2020): 41–54. Accessed November 23, 2024. http://sehs.ambis.cz/index.php/sehs/article/view/47.