Rade M. Ciric and  Nikola L. J. Rajakovic,  Concept, Modules and Objectives of the Syllabus Course: Small Power Plants and Renewable Energy Sources .   journal   = {International Journal of Energy and Power Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2016, vol. 113(5). 584 - 589
    [viewed 19 October 2019]. Available from: https://publications.waset.org/pdf/10004228.