http://etih.staff.ipb.ac.id/files/2011/07/VITAL-STATISTICS-S1.pdf
http://eprints.uad.ac.id/24230/1/Buku%20Ajar%20SURVEILANS%202_Bu%20liena_Rokhmayanti_Fatma.pdf
https://repository.dinus.ac.id/docs/ajar/PENGUKURAN_PENYAKIT.pdf
https://itjen.kemdikbud.go.id/covid19/memahami-istilah-endemi-epidemi-dan-pandemi/
https://repository.dinus.ac.id/docs/ajar/PENGUKURAN_PENYAKIT.pdf
https://currikicdn.s3-us-west-2.amazonaws.com/resourcedocs/54d37728780b0.pdf