APA format:

Genetic Science Learning Center. (2014, July 10) Stem Cells. Retrieved July 17, 2018, from https://learn.genetics.utah.edu/content/stemcells/

CSE format:

Stem Cells [Internet]. Salt Lake City (UT): Genetic Science Learning Center; 2014 [cited 2018 Jul 17] Available from https://learn.genetics.utah.edu/content/stemcells/

Chicago format:

Genetic Science Learning Center. "Stem Cells." Learn.Genetics. July 10, 2014. Accessed July 17, 2018. https://learn.genetics.utah.edu/content/stemcells/.