BibTex format
@unpublished{Haskel:2013,
author = {Haskel, J and Goodridge, P and Wallis, G},
publisher = {Imperial College Business School},
title = {Can intangible investment explain the UK productivity puzzle?},
url = {http://www3.imperial.ac.uk/business-school/research/publications/discussion_papers/haskel%202013-02},
year = {2013}
}