Surachman Suwardi, D. G. A. S. R. R. S. W. W. “Sociometry Analysis of Beef Cattle Farmers Institution in Indonesia: Case of Bina Insani As an Advanced Farmers Group”. International Journal of Advanced Science and Technology, Vol. 29, no. 3, Mar. 2020, pp. 5375 -85, http://sersc.org/journals/index.php/IJAST/article/view/6039.