Handayani, Deby. “Karakterisasi Sebaran Binomial Negatif-Binomial Negatif”. Jurnal Penelitian Dan Pengkajian Ilmiah Eksakta 1, no. 2 (July 26, 2022): 94-97. Accessed December 2, 2022. http://jurnal.unidha.ac.id/index.php/jppie/article/view/558.