M. L. O. da Silva, S. da Silva, and J. C. Leite, “Environmental education: The 3r’s (three r’s) in the first year of fundamental education”, Int J Innov Educ Res, vol. 10, no. 6, pp. 18–57, Jun. 2022, doi: 10.31686/ijier.vol10.iss6.3768.