Pagiling, Sadrack Luden, and Khumaeroh Dwi Nur’aini. “Specialized Content Knowledge Lower Secondary School Teachers on Quadrilaterals”. PYTHAGORAS Jurnal Matematika Dan Pendidikan Matematika, vol. 17, no. 1, June 2022, pp. 333-45, doi:10.21831/pythagoras.v17i1.42446.