Vania Ceccato, editor
Springer, 2012
eBooks
Lang, Jon
Van Nostrand Reinhold, 1994
Buku Teks
Lang, Jon
Van Nostrand Reinhold, 1994
Buku Referensi
The World Bank, [date of publication not identified]
Buku Teks
Firth, Jack
The Ramsay Head Press, 1979
Buku Teks