editor, J.D. Paerson
Harvester Press, 1979
Buku Referensi
O`Byrne, Peter, author
Orchid society of south east Asia, 2001
Buku Teks
APA Publications, 2011
Buku Teks
Srinivasulu, Chelmala, author
Springer, 2012
eBooks
Cambridge University Press, 1990
Buku Teks