Puspitasari, M.D. and Istiantara, D.T. 2018. Airport Railroad Service Kualanamu Elasticity (Airport Railink Service). Jurnal Perkeretaapian Indonesia (Indonesian Railway Journal). 2, 1 (Mar. 2018), 22–33. DOI:https://doi.org/10.37367/jpi.v2i1.23.