Siahaan, B., A. Khalifah Ahmad, and S. Suyatmo. “Portable Trolley Box Design As Practice Support At Aviation Polytechnic Surabaya”. 2023. Proceeding of International Conference of Advance Transportation, Engineering, and Applied Social Science, vol. 2, no. 1, Nov. 2023, pp. 106-10, doi:10.46491/icateas.v2i1.1632.