Cahyono, Luqman, et al. “EFFECT OF CANDLENUT SHELL ASH AS A SAND SUBSTITUTION ON COMPRESSIVE STRENGH OF PAVING BLOCK”. Jurnal Pensil : Pendidikan Teknik Sipil, vol. 12, no. 2, May 2023, pp. 232-40, doi:10.21009/jpensil.v12i2.34382.