Sanchia Cleosha Viorina, Septi Handayani, Nisa Kartika Komara, N. Nawan, and Ina Arleny. “Testing the Vitamin B12 Levels in Cassava Tapai”. International Journal of Health Engineering and Technology, vol. 4, no. 5, Jan. 2026, doi:10.55227/ijhet.v4i5.503.