1. Reproductive biology of Goodyera oblongifolia (Orchidaceae);Ackerman;Madroño,1975
2. Pollination biology of Calypso bulbosa var. occidentalis (Orchidaceae): a food-deceptive system;Ackerman;Madroño,1981
3. Euglossine bee pollination of the orchid, Cochleanthes lipscombiae: a food source mimic;Ackerman;American Journal of Botany,1983
4. Mechanisms and evolution of food-deceptive pollination systems in orchids;Ackerman;Lindleyana,1986