Purba, J. T., and J. D. Tan. “Owners’ Integrity, customers’ Relation, and Focused Attitude As Strategiies of Family Business Sustainability and Growth: An Empirical Study”. Journal of Economics, Business, and Accountancy Ventura, vol. 21, no. 2, Dec. 2018, pp. 187-98, doi:10.14414/jebav.v21i2.1433.