http://foodresearch.org.uk/wp-content/uploads/2016/07/Agricultural-labour-briefing-FINAL-4-July-2016.pdf
https://knowledge.wharton.upenn.edu/article/will-jobs-return/?utm_source=kw_newsletter&utm_medium=email&utm_campaign=2020-04-07
https://www.publications.parliament.uk/pa/ld201314/ldselect/ldeucom/164/164.pdf