Endo, L., M. Cerqueira, G. Nery da Silva, L. Sena Nery, and L. Kawamoto Júnior. “Descriptive and Comparative Study of the Purchasing Activity: A Case Study in a Food Company”. Brazilian Journal of Operations & Production Management, Vol. 14, no. 2, July 2017, pp. 265-71, doi:https://doi.org/10.14488/BJOPM.2017.v14.n2.a14.