BioStor
 | Botanical Observations on the Mexican Flora, Especially on the Flora of the Valley of Mexico John W Harshberger (1898) Proceedings of The Academy of Natural Sciences of Philadelphia 50: 372-413 |
 | Vegetation on bauxitic soils in Jamaica, II R A Howard and G R Proctor (1957) Journal of the Arnold Arboretum 38: 151-169 |
 | The Enumeratio and Selectarum of Nicolaus Von Jacquin R A Howard (1973) Journal of the Arnold Arboretum 54: 435-470 |
 | Additional Aphid host Relationships At Los angeles State And County Arboretum (Homoptera aphididae) H G Walker, M B Stoetzel and L Enari (1978) Proceedings of The Entomological Society of Washington 80: 575-605 |