Kurniawan Atmadja, and Miftahul Fikri. “Pelabelan Harmonis Pada Graf Tangga Segi Tiga Paku”. Limits: Journal of Mathematics and Its Applications, vol. 20, no. 2, July 2023, pp. 157-63, https://journal.its.ac.id/index.php/limits/article/view/5514.