Vermeulen, Nico
The complete encyclopediaof container plants
Rebo International, 1998
 Buku Referensi
Wilwood, Chrissie
The Encyclopedia of Healing Plants : A Complete Guide to Aromatherapy, Flower Essences and Herbal Remedies
Piatkuss, 1998
 Buku Teks SO
Beckett, Kenneth A.
The concise encyclopedia of garden plants
Grolier International, 1984
 Buku Referensi
Vermeulen, Nico
The complete encyclopedia of trees and shrubs
Rebo International, 1994
 Buku Referensi
Macmillan encyclopedia of sciences : Plants and animals
New York : macmillan Library reference USA, 1997,
 Buku Referensi