Lavigne, Marie
Macmillan Press , 1995
Buku Teks
penyunting, T. Mulya Lubis dan Richard M. Buxbaum
Yayasan Obor Indonesia, 1986
Buku Teks
by Olivier Blanchard ... [et.al.]
MIT Press, 1991
Buku Teks
Snorrason, Snorri Thomas
[Springer, ], 2012
eBooks
by the Economist Intelligence Unit and the Cartographic Dept. of the Clarendon Press
Oxford University Press, 1956
Buku Referensi