Devins, Delbert W.
John Wiley & Sons, 1982
Buku Teks
Pergamon Press, 1979
Buku Teks
Ramage, Janet, 1932-, author
Oxford University Press, 1983
Buku Teks
Demirel, Yasar, author
[Springer, ], 2012
eBooks
Organisation for Economic Cooperation and Development, 1982
Buku Teks