name=Semba>Semba, Richard (2012). "On the 'Discovery' of Vitamin A.". Annals of Nutrition and Metabolism. 61 (3): 192–198. DOI:10.1159/000343124. ISSN0250-6807.
name=Semba>Semba, Richard (2012). "On the 'Discovery' of Vitamin A.". Annals of Nutrition and Metabolism. 61 (3): 192–198. DOI:10.1159/000343124. ISSN0250-6807.