[1] British Herbal Pharmacopoeia 1983 Published by the British Herbal Medicine
Association ISBN 0 903032 07 4.
[2] Potter's New Cyclopaedia of Botanical Drugs and Preparations R.C. Wren
Revised by Elizabeth M. Williamson and Fred J Evans. First published in Great
Britain in 1988 and reprinted in 1989 and 1994 by the C. W. Daniel Company Limited.
1 Church Path, Saffron Walden Essex. Published 1988 Printed and bound by Biddles,
Guildford ISBN 085207 1973.
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[1] British Herbal Pharmacopoeia 1983 Published by the British Herbal Medicine
Association ISBN 0 903032 07 4.
[2] Drogenkunde, 8th Ed. Heinz, A., Hoppe. Pub. W. de Gruyter (1975) Berlin