Tham khảo Theodore Nicholas Gill

  1. 1 2 T. S. Palmer (1915). “In memoriam: Theodore Nicholas Gill” (PDF). A Quarterly Journal of Ornithology. XXXII (4): 391–405.
  2. 1 2 3 “Theodore Nicholas Gill”. Smithsonian Institution Archives. 13 tháng 12 năm 2017. Truy cập ngày 19 tháng 11 năm 2021.
  3. 1 2 3 William Healey Dall (1916). “Biographical Memoir of Theodore Nicholas Gill (1837-1914)” (PDF). Biographical Memoirs. Viện Hàn lâm Khoa học Quốc gia Hoa Kỳ. VIII: 313–343.

Tài liệu tham khảo

WikiPedia: Theodore Nicholas Gill http://cantic.bnc.cat/registres/CUCId/a11589656 http://catalogo.bne.es/uhtbin/authoritybrowse.cgi?... http://data.bibliotheken.nl/id/thes/p131148338 http://www.nasonline.org/publications/biographical... https://academic.oup.com/auk/article-pdf/32/4/391/... https://siarchives.si.edu/featured-topics/megather... https://www.idref.fr/130676357 https://catalog.archives.gov/id/41009045 https://id.loc.gov/authorities/names/n83825585 https://d-nb.info/gnd/101401760