@unpublished{Crawford2003,
author = {Ian Crawford},
title = {Variations in the price of foods and nutrients in the UK},
year = {2003},
month = {Oct},
volume = {pp},
doi = {10.1920/wp.ifs.2003.0319},
issn = {1742-0415},
url = {http://www.ifs.org.uk/wps/wp0319.pdf},
}