“Analysis of Social Return On Investment (SROI) To Measure The Social, Environment, And Economics Impact On The National Fattening Sheep Program (Studi At Pesantren Al-Ittifaq)” (2019) Jurnal Ilmu Sosial Politik dan Humaniora, 2(2), pp. 33–42. doi:10.36624/jisora.v2i2.24.