R. W. S. Nasution, M. Syahbudi, and A. M. B. Syarbaini, “SWOT & QSPM as A Strategy to Increase Customer Loyalty of Ekawarsa Plus Partners at AJB Bumiputera 1912 Medan”, jebe, vol. 17, no. 2, pp. 541–557, Nov. 2023, doi: 10.55208/b4g3j973.