1. Manjunatha Prasad, R., Shivaprakash Kollwad.: A Comprehensive Survey of Comtemporary Researches in Watermarking for Copyright Protection of Digital Images. International Journal of Computer Science and Network Security, vol. 9, no. 4 (2009)
2. Shivani Khurana.: Watermarking and Information-Hiding. International Journal of Computer and Information Technology, vol. 2, pp. 1679–1681 (2011)
3. Zunera Jalil, Anwar M. Mirza and Maria Sabir.: Content based Zero-Watermarking Algorithm for Authentication of Text Documents. International Journal of Computer and Information Technology, ISSN 1947-5500, vol. 7, no. 2 (2010)
4. Mohammad Ali Nematollahi, S.A.R. Al-Haddad, Faraneh Zarafshan.: Blind digital speech watermarking based on Eigen-value quantization in DWT. Journal of King University-Computer and Information Science, vol. 27, 58–67 (2015)
5. Gaurav Bhatnagar, Balasubramanian Raman.: Wavelet packet transform-based robust video watermarking technique. Indian Academy of science, vol. 37, pp. 371–388 (2012)