Economic and Social Development. 51 st International Scientific Conference on Economic and Social Development Development. Economic and Social Development : 51st International Scientific Conference on Economic and Social Development Development : Book of Proceedings. Editors: Khalid Hammes, Mustapha Machrafi, Vladimir Huzjan. 1st Edition. Varazdin : Varazdin Development and Entrepreneurship Agency, 2020. 631 s. ISSN 1849-7535.