Cempaka Kumala Sari, et al. “Perancangan Dan Pembuatan Fetal Doppler Simulator: Design and Construction of Fetal Doppler Simulator”. Bunda Edu-Midwifery Journal (BEMJ), vol. 8, no. 1, Nov. 2024, pp. 57-62, doi:10.54100/bemj.v8i1.258.