BibTex format
@unpublished{Haskel:2015,
author = {Haskel, J and Goodridge, P and Hughes, A and Wallis, G},
publisher = {Imperial College Business School},
title = {The contribution of public and private R&D to UK productivity growth},
url = {http://hdl.handle.net/10044/1/21171},
year = {2015}
}