Desmond, Ray (1977). "Charles Morgan Lemann". Darwin Correspondence Project. University of Cambridge. Archived from the original on 23 September 2015. Retrieved 3 January 2015.
doi.org
Stevens, P.F. (2003). "George Bentham (1800-1884): the life of a botanist's botanist". Archives of Natural History. 30 (2): 189–202. doi:10.3366/anh.2003.30.2.189. ISSN0260-9541.
web.archive.org
Desmond, Ray (1977). "Charles Morgan Lemann". Darwin Correspondence Project. University of Cambridge. Archived from the original on 23 September 2015. Retrieved 3 January 2015.
worldcat.org
search.worldcat.org
Stevens, P.F. (2003). "George Bentham (1800-1884): the life of a botanist's botanist". Archives of Natural History. 30 (2): 189–202. doi:10.3366/anh.2003.30.2.189. ISSN0260-9541.