“Animal husbandry students testing the butterfat content of milk at the BYU Dairy Products Laboratory under the Direction of Phil Shumway (right).” Brigham Young University: The First One Hundred Years. Vol. 3. Edited by E.L. Wilkinson and L.J. Arrington. Brigham Young University Press, 1975. https://archive.org/details/brighamyounguniv03wilk/page/606/mode/2up