Fitriani, E. “"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, vol. 2, no. 1, Jan. 2018, pp. 35-42, doi:10.20473/rlj.V2-I1.2016.35-42.