Deaibess, Amer and El Khoury, Houda. "Astronomy". OER Commons. Institute for the Study of Knowledge Management in Education, 18 Sep. 2018. Web. 15 May 2024. <https://oercommons.org/authoring/48297-astronomy>.
Deaibess, A., & El Khoury, H. (2018, September 18). Astronomy. OER Commons. Retrieved May 15, 2024, from https://oercommons.org/authoring/48297-astronomy.