Ervan Kus Indarto, K. S. H. P. Y. M. P. K. (2019) “Optimizing the function of the library as a public service facility”, Opción, 350, pp. 1574-1589. Available at: https://produccioncientificaluz.org/index.php/opcion/article/view/30132 (Accessed: 5December2025).