| Hills, H.G., Williams, N.H., and Dodson, C.H. 1968. Identification of some orchid fragrance components. Amer. Orchid Soc. Bull. 37:967-971. |
| |
| 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. |
| |
| 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. |
| |
| 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. |
| |
