Bailey, Liberty Hyde: The Standard Cyclopedia of Horticulture 3 (1915), S. 1578-1579
https://books.google.com/books?id=72EDAAAAMAAJ&pg=PA1578
Desmond, Ray: Dictionary of british and irish botantists and horticulturalists. London 1994, S. 334
https://books.google.com/books?id=thmPzIltAV8C&pg=PA334
The new international encyclopaedia 9 (1906), S. 756
https://books.google.com/books?id=xj4rAAAAMAAJ&pg=PA756
The standard reference work, for the home, school, and library 4 (1922), S. 67
https://books.google.com/books?id=PMlGAQAAMAAJ&pg=PT67
The American Seed and Nursery Industry. Biographies
http://www.sil.si.edu/SILPublications/seeds/hendersonpeter.html
Jersey City. Past and present. Peter Henderson & Company
https://www.njcu.edu/programs/jchistory/Pages/H_Pages/Henderson_Peter.htm
A history of american vegetables, herbs and flowers from the Landreth perspective 1784-1950. Part VIII. The period 1870-1880. 2010
https://www.landrethseeds.com/newsletters/Volume%205/Issue%208%20-%20Par...