Rashid, M., M. Alim, M. Rahman, M. H. Chowdhary, M. R. Khan, I. Mahmood, and A. Ekram. “Hepatitis E Vaccine: Present and Future”. TAJ: Journal of Teachers Association, vol. 22, no. 2, Dec. 2009, pp. 330-6, doi:10.3329/taj.v22i2.37755.