Suprihadi, Suprihadi, and Dedy Wibawa. 2021. “Application of Certainty Factor Method in Diagnosing Nutrient Deficiency in Coffee and Coconut Plants”. CCIT (Creative Communication and Innovative Technology) Journal 14 (2), 160-77. https://doi.org/https://doi.org/10.33050/ccit.v14i2.1376.