Vermeulen, Nico
The complete encyclopedia of trees and shrubs
Rebo Publishers, 1994
 Buku Referensi
The British Medical Association complete family health encyclopedia
edited by Tony Smith
Dorling Kindersley, 1990
 Buku Referensi
Vermeulen, Nico
The complete encyclopedia of container plants / Nico Vermeulen
Rebo , 1998
 Buku Referensi
The British medical association complete family health encyclopedia
edited by Tony Smith
Dorling Kindersley, 1995
 Buku Referensi
The New complete medical and health encyclopedia; Volume one
edited by Richard J. Wagman
J.G. Ferguson Publishing, 1992
 Buku Referensi
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