edited by Henry Steele Commager
Appleton-Century-Crofts, 1949
Buku Referensi
Bukowski, Douglas
Bedford/St. Martin's, 1999
Buku Teks
Bukowski, Douglas
Bedford/St. Martin's, 1999
Buku Teks
Binder, Frederick M.
D.C. Heath, 1988
Buku Teks
edited by Richard P. Stebbins
Published for the Council on Foreign Relations by Simon and Schuster, [1939-1970], 1963
Buku Teks