With D. R. Davis. Management of prairie habitats for insect conservation. 1982 Reproductive biology of plants in tropical forests. Ecosystems of the World, 14A. Elsevier. With H. G. Baker et al.
Butterfly species accounts.
New Jersey's Endangered and Threatened Plants and Animals. A vegetative key to the Piperaceae and Melastomataceae of Finca La Selva, Costa Rica. With S. Waltz. Characteristics and organization of the large bee pollination system in the Costa Rica Dry Forest. Handbook of Experimental Pollination Biology.