Yang, J.;                     Xu, J.;                     Gao, C.;                     Bai, G.;                     Xie, L.;                     Li, M.    
        Modeling of the Relationship Between Speed Limit and Characteristic Speed of Expressway Traffic Flow. Sustainability 2019, 11, 4621.
    https://doi.org/10.3390/su11174621
    AMA Style
    
                                Yang J,                                 Xu J,                                 Gao C,                                 Bai G,                                 Xie L,                                 Li M.        
                Modeling of the Relationship Between Speed Limit and Characteristic Speed of Expressway Traffic Flow. Sustainability. 2019; 11(17):4621.
        https://doi.org/10.3390/su11174621
    
    Chicago/Turabian Style
    
                                Yang, Jie,                                 Jinliang Xu,                                 Chao Gao,                                 Guohua Bai,                                 Linfang Xie,                                 and Menghui Li.        
                2019. "Modeling of the Relationship Between Speed Limit and Characteristic Speed of Expressway Traffic Flow" Sustainability 11, no. 17: 4621.
        https://doi.org/10.3390/su11174621
    
    APA Style
    
                                Yang, J.,                                 Xu, J.,                                 Gao, C.,                                 Bai, G.,                                 Xie, L.,                                 & Li, M.        
        
        (2019). Modeling of the Relationship Between Speed Limit and Characteristic Speed of Expressway Traffic Flow. Sustainability, 11(17), 4621.
        https://doi.org/10.3390/su11174621