Hill, W. F., author
Garden Art Press, 1995
Buku Referensi
Hill, W.F., author
Garden Art Press , 1995
Buku Referensi
Jelliffe, D. B., author
Edward Arnold, 1985
Buku Teks
Macmillan Press, Ltd., 1994
Buku Teks
edited by J.R. Landon
Longman Scientific & Technical, 1984
Buku Referensi