Macridis, Roy C.
Little, Brown, 1983
Buku Teks
Hague, Rod.
Palgrave Macmillan , 2013
Buku Teks
Curtis, Michael
Harper & Row, 1978
Buku Teks
by Carlton Clymer Rodee ... [et al.]
McGraw-Hill, 1983
Buku Teks
by Carlton Clymer Rodee ... [et al.]
McGraw-Hill Kogakusha, 1976
Buku Teks