Iriany, R., and N. Tenriana. “An Analysis of Norm Strata in the Collection of Poetry Deru Campur Debu by Chairil Anwar an Approach to Structuralism”. Edumaspul: Jurnal Pendidikan, Vol. 6, no. 2, Oct. 2022, pp. 2006-15, https://jurnal.unimen.cloud/maspuljr/article/view/4495.