Dwi Angelica Purba, H. S. Meliala, Y. P. Simanjuntak, J. L. Siregar, S. T. Sitorus, and W. Meisuri, “Analysis of Metaphors in Selected Songs by Nadin Amizah Using Ullmann’s Theory”, Sintaksis, vol. 4, no. 3, pp. 12–28, Apr. 2026.