| Hills, H.G., Williams, N.H., and Dodson, C.H. 1968. Identification of some orchid fragrance components. Amer. Orchid Soc. Bull. 37:967-971. |
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| Hills, H.G., Williams, N.H., and Dodson, C.H. 1972. Floral fragrances and isolating mechanisms in the genus Catasetum (Orchidaceae). Biotropica 4:61-76. |
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| Kaiser, R. 1993. In: The Scent of Orchids: Olfactory and Chemical Investigations, eds. Kaiser, R. Editiones Roche, Basel. 1-260. |
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| Whitten, W.M., Williams, N.H., Armbuster, W.S., Battiste, M.A., Strekowski, L., and Lindquist, N. 1986. Carvone oxide: an example of convergent evolution in euglossine pollinated plants. Syst. Bot. 11:222-228. |
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| Williams, N.H., and Whitten, W.M. 1983. Orchid floral fragrances and male euglossine bees: methods and advances in the last sesquidecade. Biol. Bull. 164:355-395. |
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