Executives for Government: Central Issues of Federal Personnel Administration. By Paul T. David and Ross Pollock. (Washington, D.C.: The Brookings Institution. 1957. Pp. x, 186. $1.50.) - The Administrative State: An Introduction to Bureaucracy. By Fritz Morstein Marx. (Chicago: University of Chicago Press. 1957. Pp. x, 202. $4.00.) - Leadership in Administration: A Sociological Interpretation. By Philip Selznick. (Evanston, Ill., White Plains, N.Y.: Row, Peterson and Company. 1957. Pp. xii, 162