Ralph credited the basic electronic principles applied in his Rapid Selector to Dr. Vannevar Bush, who had produced an earlier version at MIT. With Dr. Bush's permission, Ralph used his concepts to develop a more effective and commercially viable machine.
- Shaw, Ralph R. (1949). "Machines and the Bibliographical Problems of the Twentieth Century." (pp. 37-71) In: L. N. Ridenour, et al. Bibliography in an Age of Science. Urbana: University of Illinois Press. [^]
- Bush, Vannevar (1945). "As We May Think." The Atlantic Monthly (July 1945): 101-108. [^]
- Show R R. The rapid selector. J. Doc. 5: 165-71, 1949.