Indar, B., M. N. . Huda, and S. Syaripuddin. “Analysis of a Discrete Predator-Prey Model for Controlling The Extinction of The Pesut Mahakam (Orcaella Brevirostris) With Toxic Effect at The Mahakam River ”. Jurnal Matematika, Statistika Dan Komputasi, vol. 20, no. 1, Sept. 2023, pp. 196- 206, doi:10.20956/j.v20i1.26460.