| Malcolm Wilkins, Plantwatching, New York, Facts on File Publications, 1988, p | David Attenborough, The Private Life of Plants, Princeton University Press, Princeton, New Jersey, p |
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| John King, Reaching for The Sun, 1997, Cambridge University Press, Cambridge, p |
David Attenborough, The Private Life of Plants, Princeton University Press, Princeton, New Jersey, p.
29| Malcolm Wilkins, Plantwatching, New York, Facts on File Publications, 1988, p | Guy Murchie, The Seven Mysteries of Life, USA, Houhton Mifflin Company, Boston, 1978 p |
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| David Attenborough, The Private Life of Plants, Princeton University Press, Princeton, New Jersey, p | David Attenborough, The Private Life of Plants, Princeton University Press, Princeton, New Jersey, p |
.