SITUMORANG, R. T. R.; TIFANY, T.; HALIMATUSSAKDIAH, H. A Thematic Analysis of Sacrifice and Promise-Breaking in the Legend of Lake Toba and Tsuru No Ongaeshi: A Comparative Literary Study. DEIKTIS: Jurnal Pendidikan, Bahasa dan Sastra, v. 6, n. 2, p. 2452-2460, 16 Jun. 2026.