Ningsi, E. H., and Lambok Manurung. “The Influence of Financial Attitude and Financial Knowledge on Saving Interest (Case Study on Students of Brigjend Katamso I Vocational High School Medan)”. Jurnal Mantik, vol. 5, no. 3, Nov. 2021, pp. 1873-82, https://iocscience.org/ejournal/index.php/mantik/article/view/1769.