Marinova, Angelina. "Basic Algebra Operations". OER Commons. Institute for the Study of Knowledge Management in Education, 25 Sep. 2019. Web. 21 May 2024. <https://oercommons.org/authoring/58452-basic-algebra-operations>.
Marinova, A. (2019, September 25). Basic Algebra Operations. OER Commons. Retrieved May 21, 2024, from https://oercommons.org/authoring/58452-basic-algebra-operations.