BioStor
 | Donations to the Library, in March and April, 1848 (1848) Proceedings of The Academy of Natural Sciences of Philadelphia 4: 52-56 |
 | Proceedings of the Yorkshire Philosophical Society. Vol. I York, 1855 (1855) Annals And Magazine of Natural History 16: 128-128 |
 | Catalogue of British Hymenoptera in the collection of the British Museum. Part I. Apidæ—Bees. By Frederick Smith, M.E.S. London: Printed by Order of the Trustees, 1855. 12mo (1855) Annals And Magazine of Natural History 16: 124-128 |
 | A Reevaluation of Seed Plant Phylogeny Kevin C Nixon, William L Crepet et al. (1994) Annals of the Missouri Botanical Garden 81: 484-533 |