WASET
    Nader Gharibnavaz and  Naser Gharibnavaz,  Developing Marketing Strategy in Nonmetallic Mineral Industry at the Business Level.   journal   = {International Journal of Industrial and Systems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2012, vol. 62(2). 235 - 241
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/4499.