1. Almy, E. F., and Hull, M. E. Method of Making Low-Ash Crude Lactose. U. S. Patent 2,467,453. April, 1949.
2. A Method of Obtaining Crude Milk Sugar and Other Solids from Sweet Whey;Bell;J. Dairy Sci.,1928
3. Hull, M. E. Process for Preparing Whey Food. U. S. Patent 2,699,995. January, 1955.
4. Hull, M. E. Ion Exchange Purification of Whey in the Preparation of Lactose. U. S. Patent 2,778,750. January, 1957.
5. Hunziker, O. F. Condensed Milk and Milk Powder. 7th ed. Published by the author at LaGrange, Ill. 1949.