Puja Nur Audria, et al. “Model Matematika Persaingan Dua Spesies Dengan Toksisitas Dan Pemanenan Selektif”. Limits: Journal of Mathematics and Its Applications, vol. 16, no. 2, Dec. 2019, pp. 117-34, https://journal.its.ac.id/index.php/limits/article/view/5415.