Miskad, Upik Anderiani, et al. “Programmed Death – Ligand 1 Expression in Malignancy of Thyroid Follicular Epithelial Cell Origin”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 48, no. 5, Nov. 2019, pp. 96-106, https://www.gssrr.org/JournalOfBasicAndApplied/article/view/10432.