Tu, T. C., and H. N. Son. “Isolation, Culture Mesenchymal Stem Cells Derived from Human Placenta and Differentiation to Adipocye, Osteoblast in Vitro”. Academia Journal of Biology, vol. 32, no. 2, May 2012, pp. 84-88, doi:10.15625/0866-7160/v32n2.694.