Hubbard, G. E.
International Secretariat Institute of Pasific Relations , 1943
Buku Teks
edited by Yasuhiro Yamada ... [and others]
Springer, 2012
eBooks
Clarendon Press , 1954
Buku Teks
Tomlinson, Jim
Methuen, 1981
Buku Teks
Cullingworth, J.B.
Allen & Unwin, 1979
Buku Teks