Fauzi, Akhmad. “Analysis of the Effectiveness of Using Contractual Sentences (Sighat) in Islamic Marriages in Indonesia: John Langshaw Austin’s Speech Act Theory Perspective”. J-CEKI : Jurnal Cendekia Ilmiah, vol. 4, no. 5, Aug. 2025, pp. 1275-86, doi:10.56799/jceki.v4i5.11053.