Santanu Nandy, Vandana Maroo, and Gopinath Barui. “Immunohistochemical Analysis of Cytokeratin 7 and 20 Expression in Colorectal Carcinoma and Its Correlation With Histopathological Grading of Tumour”. Asian Journal of Medical Sciences, vol. 14, no. 7, July 2023, pp. 143-9, doi:10.3126/ajms.v14i7.52851.