Al-Joofy, Ikbal Kh., and Thana J. Al-Khishali. “Effect of Continuous Darkness on Immune Response (In Vivo Assay)”. Journal of the Faculty of Medicine Baghdad, vol. 49, no. 1, Apr. 2007, pp. 162-4, https://doi.org/10.32007/jfacmedbagdad.4911443.