Yakub, P., R. P. . Puspitawati, and A. . Bashri. “Developing Analytical Skills through Optimizing the Learning Process by Science Teachers in Nganjuk Regency”. Journal of Community Service and Empowerment, vol. 2, no. 2, Aug. 2021, pp. 77-82, doi:10.22219/jcse.v2i2.16750.