1. Al-Haj AM (2012) Advanced techniques in multimedia watermarking: image, video and audio applications. IGI Global, New York
2. Audacity (2012) Audacity manual. http://manual.audacityteam.org/man/Main_Page . Accessed 18 December 2012
3. Audio Watermarking Toolkit patent - U.S. Patent no. 8,116,514
4. AWT (2013) Audio Watermarking Toolkit homepage. http://audiowatermarking.info . Accessed 27 May 2013
5. Bhatnagar G, Raman B, Wu QMJ (2012) Robust watermarking using fractional wavelet packet domain. IET Image Process 6(4):386–397. doi: 10.1049/iet-ipr.2010.0400