C. A. . Paraguassu-Chaves, “ Quantitative methods and study of the parth dependence effect of Douglass North from the cocoa production index (CPI) in Rondônia, Brazil”, Int J Innov Educ Res, vol. 8, no. 4, pp. 469–493, Apr. 2020, doi: 10.31686/ijier.vol8.iss4.2300.