Mukhammad Solikhin, Y. Pratama, Purnama Pasaribu, Josua Rumahorbo, and Bona Simanullang. “Analisis Watermarking Menggunakan Metode Discrete Cosine Transform (DCT) Dan Discrete Fourier Transform (DFT)”. Jurnal Sistem Cerdas, Vol. 5, no. 3, Dec. 2022, pp. 155 -70, doi:10.37396/jsc.v5i3.192.