O`Byrne, Peter, author
Orchid society of south east Asia, 2001
Buku Teks
World Bank
Oxford University Press for the World Bank, 1993
Buku Teks
edited by David Kelly and Anthony Reid
Cambridge University Press, 1991
Buku Teks
Oxford University Press , 1993
Buku Teks
edited by Denis Dwyer
Longman, 1990
Buku Teks