Huge-Brodin, M. (n.d.). The Role of Logistics Service Providers in the Development of Sustainability-Related Innovation. Supply Chain Innovation for Competing in Highly Dynamic Markets, 215--223
 https://doi.org/10.4018/978-1-60960-585-8.ch014 Hutabarat, R. (1994). Transaksi Ekspor Impor (2nd ed.). jakarta: erlangga.
 M.S. Amir. (2005). Ekspor Impor: Teori dan Penerepannya. jakarta: PPM.
Moleong. Lexy J. (2006). Metode penelitian Kualitatif (edisi revi). bandung: PT. Remaja Rosdakarya.
Pattiasina, P. (2014). Analysis of Operational Loading and Unloading Equipment in Sea Transportation. Case Studies in Business and Management, 1(2), 1. https://doi.org/10.5296/csbm.v1i2.6265
Pereira, D., Vieira, J. G. V., Silva, J. E. A. R. da, & Possidnio, E. F. S. C. (2015). Assessing carriers logistical performance indicator by shippers in the So Paulo Metropolitan Area. Journal of Transport Literature, 9(4), 30--34.
https://doi.org/10.1590/2238- 1031.jtl.v9n4a6