Singh Gill, Dr. Maninder Pal. 2013. “Comparative Study of Serum Gamma Glutamyltransferase, 5’ Nucleotidase and Alkaline Phosphatase in Icteric and an-Icteric Biliary Disease Patients”. IIUM Medical Journal Malaysia 12 (1). https://doi.org/10.31436/imjm.v12i1.2004.