Kuncoro, A., I. Suwarso, R. H. P, and I. Gunawan. “Loyalitas Konsumen: (Relationship Marketing Herbalife Semarang)”. Jurnal Bingkai Ekonomi (JBE), Vol. 6, no. 1, Feb. 2021, pp. 72-83, doi:10.54066/jbe.v6i1.103.