Girsang, Rosmaria, et al. “Attack Intensity of Coffee Berry Borer Hypothenemus Hampei Ferr at Different Altitudes in Simalungun Regency and Control Efforts Using Attractants ”. Jurnal Penelitian Pendidikan IPA, vol. 9, no. 12, Dec. 2023, pp. 11117-25, doi:10.29303/jppipa.v9i12.5754.