Australian council of social service, 0
Buku Teks
Ministry of culture and information, 1970
Buku Referensi
Buddingh, C.
De Bezige Bij, 1979
Buku Teks
General Agreement on Tariffs and Trade, 1971
Buku Teks
edited by Eric P. Hamp
Mouton, 1973
Buku Teks