https://ghr.nlm.nih.gov/primer/basics/cell

https://www.yourgenome.org/facts/what-is-a-cell

https://www.britannica.com/science/cell-membrane

https://www.britannica.com/science/mitochondrion

https://www.britannica.com/science/endoplasmic-reticulum

https://study.com/academy/lesson/lysosome-definition-function-quiz.html

http://hyperphysics.phy-astr.gsu.edu/hbase/Biology/golgi.html

https://www.nature.com/scitable/definition/cytoplasm-280/

Oxford Languages. In class teaching.