Grad, Roni. “Respiration, Ensoulment, and Personhood of the Human Zygote and Preimplantation Embryo”. Verba Vitae 3, no. 2 (August 10, 2026): 119–145. Accessed August 10, 2026. https://verba-vitae.org/index.php/vvj/article/view/129.