Refs:
- ^ http://www.scotsman.com/news/obituaries/professor-norman-simmonds-1-594431
- ^ http://www.independent.co.uk/news/obituaries/professor-norman-simmonds-9270775.html
- ^ https://www.royalsoced.org.uk/cms/files/fellows/obits_alpha/simmonds_norman.pdf
- ^ http://dx.doi.org/10.1017/S0014479702001096
- ^ Jules Janick (14 March 2002). Plant Breeding Reviews. John Wiley & Sons. pp. 1–. ISBN 978-0-471-43775-8.