Martindell, Toni. "Ancient Civilizations". OER Commons. Institute for the Study of Knowledge Management in Education, 24 Jan. 2018. Web. 01 May 2024. <https://oercommons.org/authoring/26790-ancient-civilizations>.
Martindell, T. (2018, January 24). Ancient Civilizations. OER Commons. Retrieved May 01, 2024, from https://oercommons.org/authoring/26790-ancient-civilizations.