Cisneros-Reyes, Y. D., J. E. Rocha-Ibarra, and M. G. Arredondo-Hidalgo. “Characteristics of Mexican Leather Footwear Industry and Its International Trade Activity, Correlation of Productivity, and Competitiveness”. European Scientific Journal, ESJ, Vol. 14, no. 22, Aug. 2018, p. 63, doi:10.19044/esj.2018.v14n22p63.