Cockerell, T.D.A. (1918). "The story of the red sunflower". The American Museum Journal. 18: 39–47. Archived from the original on 2020-12-10. Retrieved 2020-11-29 – via Biodiversity Heritage Library.
Pollard, Charles Louis; Cockerell, Theodore Dru Alison (6 August 1902). "Four new plants from New Mexico". Proceedings of the Biological Society of Washington. 15: 177–179. Archived from the original on 27 November 2020. Retrieved 20 August 2020.
Pilsbry, H. A.; Cockerell, T. D. A. (September 1899). "Another new Ashmunella". The Nautilus. 13: 49–50. Archived from the original on 2020-12-12. Retrieved 2020-11-30 – via Biodiversity Heritage Library.
Cockerell, T.D.A. (1902). "Three new species of Chromodoris". The Nautilus. 16 (2): 19–21. Archived from the original on 2020-11-07. Retrieved 2020-11-30 – via Biodiversity Heritage Library.
King, George B. (1902-02-01). "Some new Coccidae". Entomological News, and Proceedings of the Entomological Section of the Academy of Natural Sciences of Philadelphia. 13: 41–43. Archived from the original on 2021-10-12. Retrieved 2020-12-01 – via Biodiversity Heritage Library.
Cockerell, T. D. A.; Pilsbury, H. A. (June 1933). "21. African Mollusca, chiefly from the Belgian Congo". Proceedings of the Zoological Society of London. 103 (2): 365–375. doi:10.1111/j.1096-3642.1933.tb01599.x.
Rose, J. N. "Rose, greenhouse cacti, 1912, 1919 - 1929"(PDF). Smithsonian Institution Collections Search Centre. Smithsonian Institution. Archived(PDF) from the original on April 2, 2015. Retrieved March 22, 2015.
Cockerell, T.D.A. (1918). "The story of the red sunflower". The American Museum Journal. 18: 39–47. Archived from the original on 2020-12-10. Retrieved 2020-11-29 – via Biodiversity Heritage Library.
Rose, J. N. "Rose, greenhouse cacti, 1912, 1919 - 1929"(PDF). Smithsonian Institution Collections Search Centre. Smithsonian Institution. Archived(PDF) from the original on April 2, 2015. Retrieved March 22, 2015.
Pollard, Charles Louis; Cockerell, Theodore Dru Alison (6 August 1902). "Four new plants from New Mexico". Proceedings of the Biological Society of Washington. 15: 177–179. Archived from the original on 27 November 2020. Retrieved 20 August 2020.
Pilsbry, H. A.; Cockerell, T. D. A. (September 1899). "Another new Ashmunella". The Nautilus. 13: 49–50. Archived from the original on 2020-12-12. Retrieved 2020-11-30 – via Biodiversity Heritage Library.
Cockerell, T.D.A. (1902). "Three new species of Chromodoris". The Nautilus. 16 (2): 19–21. Archived from the original on 2020-11-07. Retrieved 2020-11-30 – via Biodiversity Heritage Library.
King, George B. (1902-02-01). "Some new Coccidae". Entomological News, and Proceedings of the Entomological Section of the Academy of Natural Sciences of Philadelphia. 13: 41–43. Archived from the original on 2021-10-12. Retrieved 2020-12-01 – via Biodiversity Heritage Library.