If you prefer to cite using MLA or APA, 7th edition citation styles, first create a citation for your source using a particular citation style, and then simply add the CC or public domain license info at the end of your regular citation.
Berger, E., Israel, G., Miller, C., Parkinson, B., Reeves, A., & Williams, N. (2016). World history: Cultures, states, and societies to 1500. History Open Textbooks, 2. https://www.oercommons.org/courses/world-history-cultures-states-and-societies-to-1500/view. CC BY-SA 4.0.
Roe, K. (2012, April 22). Leads castle [Photograph]. Flickr. https://flic.kr/p/c35GPj. CC BY 2.0.
Khan Academy. (2017, January 16). History and prehistory: The origin of humans and human societies [Video file]. https://www.khanacademy.org/humanities/world-history/world-history-beginnings/origin-humans-early-societies/v/history-and-prehistory. CC BY-NC-SA.
Lincoln, A. et al. Human Rights. E-book, MIOpenBook, 2017. OER Commons, http://www.oercommons.org/courses/world-history/view. Accessed 29 January 2019. CC BY-NC-SA 4.0.
Roe, Karen. Leads Castle. 2012 Online image. Flickr, uploaded 29 January 2019, https://flic.kr/p/c35GPj. Accessed 11 May, 2019. CC BY 2.0.
Khan Academy. “History and Prehistory: The Origin of Humans and Human Societies.” YouTube, uploaded by Khan Academy 16 January 2017, https://youtu.be/ObGarwy5Jss. Accessed 11 May 2019. CC BY-NC-SA.
Content included in the OER by Subject Research Guide by Skyline Library is licensed CC BY 4.0 unless otherwise indicated.