1. Code of Federal Regulations, Title 21—Food and Drugs, Parts 1 to 129. Section 46.1. Washington: U.S. Govt. Printing Office (1966).
2. Woodroof, J. G.: Effect of processing and storage on Vitamin A incorporated into peanut butter”. Food Technology Ibid., 381 (1954)p. 283
3. Trager, W. T., Stoloff, L. and Campbell, A. D.: J. Assoc. Offic. Agr. Chemists, 47: 993 (1964).
4. Salwin, H.: J. Assoc. Offic. Agr. Chemists, 49: 63 (1966).
5. Campbell, A.D. and Funkhouser, J. T.: J. Assoc. Offic. Agr. Chemists, 49: 730 (1966).