Batubara, P., E. Rosmaini, and E. Nababan. “Kajian Masalah Transshipment Tidak Seimbang Menggunakan Metode Least Cost - Stepping Stone Dan Metode Least Cost - Modi”. Talenta Conference Series: Science and Technology (ST), Vol. 1, no. 1, Oct. 2018, pp. 049 -58, doi:10.32734/st.v1i1.189.