Sihombing, F. N., K. Tampubolon, and T. Juniarsih. “Regression Factors of Rainfall, Humidity, and Rainy Day on Pepper Yield and Policy Alternatives in North Sumatra”. Agrinula : Jurnal Agroteknologi Dan Perkebunan, Vol. 3, no. 2, Oct. 2020, pp. 73-83, doi:10.36490/agri.v3i2.102.