Widyawati, Lilik, et al. “Comparative Analysis of Image Steganography Using SLT, DCT and SLT-DCT Algorithm”. MATRIK : Jurnal Manajemen, Teknik Informatika Dan Rekayasa Komputer, vol. 20, no. 1, Sept. 2020, pp. 169-82, https://doi.org/10.30812/matrik.v20i1.701.