-      Hartlapp, Miriam and Hofmann, Andreas (2021). ‘The use of EU soft law by national courts and bureaucrats: how relation to hard law and policy maturity matter’, West European Politics 44(1): 134–154. https://www.tandfonline.com/eprint/IXWMXESQNGYJ96KZUBJD/full?target=10.1080/01402382.2020.1738095

-      Hartlapp, M. (2020). Measuring and comparing the regulatory welfare state: Social objectives in public procurement: Special Issue "The Reassertion of the Regulatory Welfare State". Annals of the American Academy of Political and Social Sciences (691).
https://uk.sagepub.com/en-gb/eur/the-annals-of-the-american-academy-of-political-and-social-science/book276829