Suroto, S. “Development of a Visitor Management System According to The Demands of Higher College Libraries in The 4.0 Era”. JPUA: Jurnal Perpustakaan Universitas Airlangga: Media Informasi Dan Komunikasi Kepustakawanan, vol. 13, no. 2, Dec. 2023, pp. 84-93, doi:10.20473/jpua.v13i2.2023.84-93.