krack, michelle. "Physics Rube Goldberg project". OER Commons. Institute for the Study of Knowledge Management in Education, 09 Dec. 2013. Web. 22 Jul. 2024. <https://oercommons.org/authoring/4555-physics-rube-goldberg-project>.
krack, m. (2013, December 09). Physics Rube Goldberg project. OER Commons. Retrieved July 22, 2024, from https://oercommons.org/authoring/4555-physics-rube-goldberg-project.