1. A Global Study on Digital Capabilities, World Bank Group, by Samia Melhem and Astrid Herdis Jacobsen, 21-28;
2. "A Stronger Digital Industrial Europe, Digital Transformation as its Focus, Digital Europe", https://digital-europe-website-v1.s3.fr-par.scw.cloud/uploads/2020/02/DigitalEurope-A-Stronger-Digital-Industrial-Europe.pdf (25.12.2022);
3. Albidewi Ibrahim (2014): "E-leadership system: A Futuristic Vision", International Journal of Business and Management Review, Vol. 2, No. 2, 91-101;
4. Anchal Aggarwal Renu (2014): "E-Leadership - A New and modern Style of Leadership", International Journal of Advances in Management and Economics, Sept.-Oct. 2014, Vol.3, Issue 5, 88-93;
5. Avolio Bruce et. al. (2014): "E-leadership: Re-examining transformations in leadership source and transmission", The Leadership Quarterly, 25(1), 105-131;