Fitriani, Erni. “"EF” Method to Determine Books Inventory Number on Book Acquisition at Library of Lampung Unversity Case Study : Acquisition Book at 2012 and 2013”. Record and Library Journal 2, no. 1 (January 5, 2018): 35–42. Accessed March 11, 2025. https://e-journal.unair.ac.id/RLJ/article/view/7218.