Widiyaningrum, Kurniasari, et al. “Penumbuhan Kemampuan Berpikir Kritis PKn Melalui Model Numbered Head Together”. Jurnal Civics: Media Kajian Kewarganegaraan, vol. 16, no. 2, Oct. 2019, pp. 199-08, doi:10.21831/jc.v16i2.21518.