1. Burgwald, L. H., revised by Grant, F. M. Cleaning Milking Machines. U.S.D.A. Farmers’ Bulletin No. 1315, 1939.
2. Chemical Sterilization of Dairy Utensils;Prouty;State Coll. Wash., Ext. Bul.,1937
3. Standard Methods for the Examination of Water and Sewage, sixth edition, 1925, published by Amer. Pub. Health Assoc. and Amer. Water Works Assoc.
4. Standard Methods for the Examination of Dairy Products, eighth edition, 1941, published by the Amer. Pub. Health Assoc.