Annan Putri, P.A., Raden Johny Hadi Raharjo and Nurul Hasanah 2023. Increasing The Effectiveness And Efficiency Of Supply Chain Management In Increasing Customer Loyalty B21 Digital Printing. JIMEK : Jurnal Ilmiah Mahasiswa Ekonomi. 6, 01 (Jun. 2023). DOI:https://doi.org/10.30737/jimek.v6i01.4373.