John G. Hawkes (1992). "William Lobb in Ecuador and the Enigma of Solanum lobbianum". Taxon. 41 (3): 471–475. doi:10.2307/1222817. JSTOR1222817. and offline Taxon, Vol. 41, No. 3 (Aug., 1992), pp. 471-475.
dupont.com
"1857 Lammot du Pont". Innovation Starts Here. E. I. du Pont de Nemours and Company. 2015. Retrieved 25 April 2015.
jstor.org
John G. Hawkes (1992). "William Lobb in Ecuador and the Enigma of Solanum lobbianum". Taxon. 41 (3): 471–475. doi:10.2307/1222817. JSTOR1222817. and offline Taxon, Vol. 41, No. 3 (Aug., 1992), pp. 471-475.