WASET
    Amalia Suzianti,  A Heuristic Based Conceptual Framework for Product Innovation.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2012, vol. 67(7). 1259 - 1267
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/11376.