1. American Dry Milk Institute. Report of Collaborative Study of the Direct Microscopic Clump Count Procedure for Nonfat Dry Milk. October 3, 1957.
2. Arph, S.-O. Investigation into the Possibility of Removing Bacteria from Milk by Centrifugal Force with Special Reference to Spores of Butyric Acid Bacteria. Svenska Mejeritidn., 48: 463, 1956.(See Dairy Sci. Abstr., 19: 47. 1957.).
3. The Direct Microscopic Count as a Method for Counting Bacteria in Pasteurized Milk;Baker;J. Dairy Sci.,1946
4. Black, L. A., Cook, E. W., McCaffrey, J. C, and Steele, G. H. Report of Standing Laboratory Committee. Seventh National Conference on Interstate Milk Shipment. April 20, 1959.
5. Black, L. A., and Myers, R. P. Some Causes of Variation in Direct Microscopic Counts. Report of New York State Association of Milk Sanitarians, page 9. 1952.