21 מחשבות על המאה ה-21

7 deadly scenarios : a military futurist explores war in the twenty-first century / Andrew F. Krepinevich.

Andrew F. Krepinevich

U.S. security in the twenty-first century / Barry M. Blechman.

Barry M. Blechman

Educating for the twenty-first century / [by] Kingman Brewster [and others] Lectures given on the occasion of the final week celebration of the University of Illinois Centennial Year, March 6 to 11, 1968.

Visions [electronic resource] : how science will revolutionize the twenty-first century.