Marco OgĂȘ Muniz and  Luiz Fernando Gonçalves De Figueiredo,  Design and Social Innovation: A Systemic Approach.   journal   = {International Journal of Humanities and Social Sciences}, [online]. World Academy of Science, Engineering and Technology.
    June 2009, vol. 30(6). 908 - 914
    [viewed 20 January 2020]. Available from: https://publications.waset.org/pdf/5852.