Siahaan, G.; Manalu, M.; Rumida; Ginting, R. S.; Manurung, A.; Sihombing, L.; Farida, F.; Akmal, A. R. Counselling and Training of Nutritional Snacks Making for Immunity Increasing During Covid 19 Pandemic. J.Saintech Transf. 2023, 5, 102-109.