BioStor
 | Flora of Panama. Part III. Fascicle IV Paul H Allen (1949) Annals of the Missouri Botanical Garden 36: 1-132 |
 | Flora of Panama. Part III. Fascicle I Paul H Allen (1949) Annals of the Missouri Botanical Garden 36: 133-257 |
 | ORCHID FLORAL FRAGRANCES AND MALE EUGLOSSINE BEES: METHODS AND ADVANCES IN THE LAST SESQUIDECADE Norris H Williams and W Mark Whitten (1983) Biol Bull 164: 355-395 |