Sembiring, F., Zuska, F., Ginting, B., Ismail, R., & Sitorus, H. (2019). Ego-Centric Social Network Analysis in Marketing of Fish From Cage Culture System In Simalungun District, Indonesia. International Journal of Research in Business and Social Science (2147- 4478), 8(4), 105-113. https://doi.org/10.20525/ijrbs.v8i4.282