Thompson, Warren S.
      
      
         The University of Chicago Press, 1959
       Buku Teks SO
   
Clyde, Paul Hibbert
      
      
         Prentice-Hall, 1953
       Buku Teks
   
Walker, Allan S.
      
      
         Australian War Memorial, 1956
       Buku Teks SO
   
      
      
         Europe Publications Limited, 1992
       Buku Referensi
   
Latourette, Kenneth Scott
      
      
         Macmillan, 1957
       Buku Teks SO