1. The churn as a factor in the contamination of butter;Gregory;N. Y. Prod. Rev. and Amer. Creamery,1920
2. Haglund, E., Barthel, C, and Waller, E. Kärnans skötsel och det fram-ställda smörets kvalitet och hållbarhet. Meddel. Centralanst Försöksv. Jordbruksomrädet (Sweden), No. 297, (1926). Original paper examined. Translation by C. L. Brooke.
3. The cause and prevention of mould in Canadian pasteurized butter;Hood;Canada Dept. Agr. Bul.,1925
4. A study of churn sanitation;James;Sci. Agr.,1929
5. Yeasts and mold in butter;Lund;N. Y. Prod. Rev. and Amer. Creamery,1920