United States Adjutant-General's Office Military Information Division, Perley, C. W., & Martel, C. (1928). Classification. Class U: Military science (2nd ed.). U. S. Government Printing Office.
Dyfyniad Arddull ChicagoUnited States Adjutant-General's Office Military Information Division, Clarence W. Perley, and Charles Martel. Classification. Class U: Military Science. 2nd ed. Washington: U. S. Government Printing Office, 1928.
Dyfyniad MLAUnited States Adjutant-General's Office Military Information Division, et al. Classification. Class U: Military Science. 2nd ed. U. S. Government Printing Office, 1928.
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