Praeger, R. Lloyd. "Nathaniel Colgan". Some Irish Naturalists: A Biographical Note-book. National Botanic Gardens of Ireland. Archived from the original on 15 November 2017. Retrieved 17 February 2015.
habitas.org.uk
Nunn, J.D.; Holmes, J.M.C. (2008). "History of the Irish & British Marine Molluscan Collections". A Catalogue of the Irish and British Marine Mollusca in the collections of the National Museum of Ireland - Natural History 1835-2008. National Museums Northern Ireland. Retrieved 17 February 2015.
Praeger, R. Lloyd. "Nathaniel Colgan". Some Irish Naturalists: A Biographical Note-book. National Botanic Gardens of Ireland. Archived from the original on 15 November 2017. Retrieved 17 February 2015.
