DOUGLAS, Angela Elizabeth. Symbiotic Interactions. [s.l.]: Oxford University Press, 2002. Dostupné online. ISBN9780198542865. S. 145.
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WITMER, M. C.; CHEKE, A. S. The dodo and the tambalacoque tree: an obligate mutualism reconsidered. Oikos. 1991, čís. 61 (1), s. 133–137. Dostupné online.