United States. Office of Scientific Research and Development. National Defense Research Committee, James, H. M., Phillips, R. S., & Nichols, N. B. (1947). Theory of servomechanisms. McGraw-Hill.

United States. Office of Scientific Research and Development. National Defense Research Committee, Hubert Maxwell James, Ralph S. Phillips, and N. B. Nichols. Theory of Servomechanisms. New York: McGraw-Hill, 1947.

United States. Office of Scientific Research and Development. National Defense Research Committee, et al. Theory of Servomechanisms. McGraw-Hill, 1947.