Sulma, S., S. Toaha, and K. Kasbawati. “Stability Analysis of Mathematical Models of the Dynamics of Spread of Meningitis With the Effects of Vaccination, Campaigns and Treatment”. Jurnal Matematika, Statistika Dan Komputasi, vol. 17, no. 1, Aug. 2020, pp. 71-81, doi:10.20956/jmsk.v17i1.10031.