1. Eine Methode zur Bestimmung des Elektrischen Elementarquantums;Ehrenhaft;Physikalische Zeitschrift,1909
2. Subelectrons, presupositions, and the Millikan-Ehrenhaft dispute;Holton;Historical Studies in the Physical Sciences,1978
3. Jones, L.W., The Millikan oil-drop experiment: Making it worthwhile, American Journal of Physics, 63, 970-7.
4. A new modification of the cloud method of determining the elementary electrical charge and the most probable value of that charge;Millikan;Philosophical Magazine,1910
5. On the elementary electrical charge and the Avogadro constant;Millikan;The Physical Review,1913