Forth, Gregory L., author
Martinus Nijhoff, 1981
Buku Teks
Ellis, Anthony, author
Routledge, 2017
Buku Teks
Blease, Derek, author
Paul Chapman, 1990
Buku Teks
Djuretna A. Imam Muhni, author
Gadjah Mada University Press , 1994
Buku Teks
Ont. International Development Research Centre, 1986
Buku Teks