Garzón Díaz, W., Reyes Macís, G. and Salazar Solano, F. 2018. Sales System for Sánchez Bookstore, Siuna, 2016. University Journal of the Caribbean. 19, 2 (Oct. 2018), 47-55. DOI:https://doi.org/https://doi.org/10.5377/ruc.v19i2.6470.