Laetsch, Watson M., author
Little, Brown, 1979
Buku Teks
Bell, Peter Robert, author
Dioscorides Press , 1992
Buku Teks
Tivy, Joy, author
Longman Scientific & Technical, 1993
Buku Teks
Plowden, C. Chicheley
George Allen and Unwin, 1972
Buku Teks
Corner, E.J.H.
The World Publishing Company, 1964
Buku Teks