Clinton, Aaron, and Nathan discuss the scientific facts of embryology and how we know that the unborn human being is one of us, biologically.
Keith Moore and T.V.N. Persaud, The Developing Human: Clinically Oriented Embryology, 7th ed.
Ronan O'Rahilly and Fabiola Müller, Human Embryology and Teratology, 3rd edition. New York: Wiley-Liss, 2001. p. 8.
Maureen Condic, Ph.D., A Scientific View of When Life Begins, On Point, Charlotte Lozier Institute, June 2014 https://lozierinstitute.org/wp-content/uploads/2014/06/On-Point-Scientific-View-of-When-Life-Begins-Condic-2014.pdf (accessed 6/12/17)