Saragih, J., and B. Manurung. “Study Ecology of Insects on Cocoa (Theobroma Cacao L.) Plantation With and Without Insecticide Application in North Sumatera, Indonesia”. Journal of Applied Entomologist, vol. 6, no. 1, Jan. 2026, pp. 09-14, doi:10.64171/JAE.6.1.9-14.