Dictionary of National Biography 48 (1896), S. 240-241
http://www.archive.org/stream/dictionaryofnati48stepuoft#page/240
https://en.wikisource.org/wiki/Richardson,_Richard_%28DNB00%29
Desmond, Ray: Dictionary of british and irish botantists and horticulturalists. London 1994, S. 581-582
https://books.google.com/books?id=thmPzIltAV8C&pg=PA581
Parks & Gardens UK
http://www.parksandgardens.org/places-and-people/person/1142