editor, Heide and Udo ernst Simonis
Otto Harrassowitz - Wiebaden , 1974
Buku Teks
Senelle, Robert
Ministry of Foreign Affairs and External Trade , 1979
Buku Teks
Clough, Ray W., 1920-
McGraw-Hill , 1975
Buku Teks
Clough, Ray W., 1920-
McGraw-Hill, 1993
Buku Teks
Clough, Ray W., 1920-
Erlangga, [1988;1988, 1988]
Buku Teks