Salman, Dhuha D., and AsInas M. Al-aubadima. “Preparation of Shrimp Shells Chitosan and Use It in Extending Eggs Shelf Life”. Journal of Biotechnology Research Center (JOBRC), vol. 4, no. 2, June 2010, pp. 68-77, doi:10.24126/jobrc.2010.4.2.126.