1. Mechanisms and evolution of food-deceptive pollination systems in orchids;Ackerman;Lindleyana,1986
2. Limitations to sexual reproduction in Encyclia krugii (Orchidaceae);Ackerman;Syst. Bot.,1989
3. Ackerman, J.D., 1995. An orchid flora of Puerto Rico and the Virgin Islands, vol. 73. NYBG, New York.
4. Short- and long-term limitations to fruit production in a tropical orchid;Ackerman;Ecology,1990
5. Reproductive biology of Oncidium variegatum: moon phases, pollination, and fruit set;Ackerman;Am. Orchid Soc. Bull.,1985