BioStor
 | The Bases of Angiosperm Phylogeny: Cytology Peter H Raven (1975) Annals of the Missouri Botanical Garden 62: 724-764 |
 | Studies in Neotropical Paleobotany. IV. The Eocene Communities of Panama Alan Graham (1985) Annals of the Missouri Botanical Garden 72: 504-534 |
 | Studies in Neotropical Paleobotany. VII. The Lower Miocene Communities of Panama-The La Boca Formation Alan Graham (1989) Annals of the Missouri Botanical Garden 76: 50-66 |