1. A study of methods for the determination of acidity in butterfat;Breazeale;J. Dairy Sc.,1938
2. Concerning rancidity of butter;Guthrie;J. Dairy Sc.,1917
3. Orla-Jensen, S. Studien über das Ranzigwerden der Butter. Centr. für Bakt., Abt. 2, 8: 11–16, 42–46, 74–80, 107–114, 140–144, 171–174, 211–216, 248–252, 309–312, 342–346, 367–369, 406–409. 1902.