Press and Information Office of the Federal Government, 1961
Buku Teks SO
Muller, Karlhans
Inter Nationes, 1981
Buku Teks SO
Muller-Daehn, Claus
Inter Nationes, 1969
Buku Teks
Deddy Wibowo Lesmana
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 1979
UI - Skripsi Membership
Erhard, Ludwig
George Allen and Unwin, 1954
Buku Teks