S. Priyanto and  E.P Friandi,  Analyzing of Public Transport Trip Generation in Developing Countries; A Case Study in Yogyakarta, Indonesia.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2010, vol. 42(6). 167 - 171
    [viewed 12 December 2019]. Available from: https://publications.waset.org/pdf/15735.