Heeger, Hanna. "Conception to Birth". OER Commons. Institute for the Study of Knowledge Management in Education, 01 Feb. 2017. Web. 04 May 2024. <https://oercommons.org/authoring/19874-conception-to-birth>.
Heeger, H. (2017, February 01). Conception to Birth. OER Commons. Retrieved May 04, 2024, from https://oercommons.org/authoring/19874-conception-to-birth.