^(Inggris)"Analysis of SNPs and Haplotypes in Vitamin D Pathway Genes and Renal Cancer Risk". Core Genotyping Facility at the Advanced Technology Center of the National Cancer Institute, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health (NIH), Department of Health and Human Services, International Agency for Research on Cancer, Department of Cancer Epidemiology and Genetics, Masaryk Memorial Cancer Institute, Institute of Public Health, Institute of Carcinogenesis, Cancer Research Centre, Department of Preventive Medicine, Faculty of Medicine, Palacky University, Institute of Hygiene and Epidemiology, First Faculty of Medicine, Charles University, Department of Epidemiology, Institute of Occupational Medicine, Ohio State University Medical Center; Sara Karami, Paul Brennan, Philip S. Rosenberg, Marie Navratilova, Dana Mates, David Zaridze, Vladimir Janout, Helena Kollarova, Vladimir Bencko, Vsevolod Matveev, Neonila Szeszenia-Dabrowska, Ivana Holcatova, Meredith Yeager, Stephen Chanock, Idan Menashe, Nathaniel Rothman, Wong-Ho Chow, Paolo Boffetta, dan Lee E. Moore. Diakses 2010-12-10.
^(Inggris)"Vitamin D Deficiency and Liver Disease". Medicine Medical Director of Liver Transplantation University of Tennessee Health Science Center; Satheesh Nair. Diakses 2010-12-10. "The liver produces 25-hydroxy (25-OH) vitamin D, also known as calcidiol, the immediate precursor to the metabolically active 1,25 dihydroxyvitamin D 1-25 vitamin D, also known as calcitriol."
^(Inggris)"Vitamin D and Human Health: Lessons from Vitamin D Receptor Null Mice". Katholieke Universiteit Leuven, Laboratory of Experimental Medicine and Endocrinology, Massachusetts General Hospital, Endocrine Unit; Roger Bouillon, Geert Carmeliet, Lieve Verlinden, Evelyne van Etten, Annemieke Verstuyf, Hilary F. Luderer, Liesbet Lieben, Chantal Mathieu, dan Marie Demay. Diakses 2010-12-10. "To gain more insight into the antiproliferative and prodifferentiating effect of 1,25-(OH)2D, genomic profiling has been performed in malignant cells such as prostate (127,128,129,130,131,132,133), breast (134,135,136), leukemia (137,138), colon (139), and ovarian cancer (140) cells, and squamous cell carcinoma cells (141). Since then, the antineoplastic activity of 1,25-(OH)2D was shown both in vitro and in vivo in a wide variety of malignancies, such as leukemia (266,267) and colon (268,269), breast (270,271,272), and prostate cancer (273,274)."