@unpublished{Meghir2010,
author = {Costas Meghir and Steven Rivkin},
title = {Econometric methods for research in education},
year = {2010},
month = {May},
doi = {10.1920/wp.ifs.2010.1010},
issn = {1742-0415},
url = {http://www.ifs.org.uk/wps/wp1010.pdf},
}