Garzón Díaz, W., G. Reyes Macís, and F. Salazar Solano. “Sales System for Sánchez Bookstore, Siuna, 2016”. University Journal of the Caribbean, Vol. 19, no. 2, Oct. 2018, pp. 47-55, doi:https://doi.org/10.5377/ruc.v19i2.6470.