Seo, Grace. "Open Textbook Test". OER Commons. Institute for the Study of Knowledge Management in Education, 07 Jan. 2019. Web. 28 Nov. 2024. <https://oercommons.org/authoring/51131-open-textbook-test>.
Seo, G. (2019, January 07). Open Textbook Test. OER Commons. Retrieved November 28, 2024, from https://oercommons.org/authoring/51131-open-textbook-test.