Siregar, Elida Hafni, Aida Fitriani Sitompul, Syarifuddin, and Yusron Efendi. 2023. “Attack Intensity Variety of Coffea Arabica and Coffea Canephora Hypothenemus Hampei Ferrari, 1867 (Coleoptera: Curculionidae: Scolytinae) in North Sumatra ”. Nusantara Science and Technology Proceedings, January, 1-7. https://doi.org/10.11594/nstp.2023.3001.