BioStor
 | List of plants collected by Dr. Edward Palmer in Lower California in 1889 George Vasey and Joseph N Rose (1889) Proceedings of The United States National Museum 11: 527-536 |
 | The botanical explorations of Thomas Nuttall in California F V Coville (1900) Proceedings of The Biological Society of Washington 13: 109-121 |
 | XVI. Hymenoptera aculeata, collected in Algeria by the Rev Alfred Edwin Eaton and Francis David Morice (1901) Transactions of The Royal Entomological Society of London 49: 515-564 |
 | Studies in the flora of Lower California and adjacent islands Alice Eastwood (1929) Proceedings of the California Academy of Sciences 18: 393-484 |