1. Are RCTs the gold standard?;Cartwright;BioSocieties,2007
2. Causality and exogeneity in non-stationary economic time series;Hendry,2004
3. On the definition of political economy and on the method of philosophical investigation in that science;Mill,1836
4. Identifying and Implementing Education Practices Supported by Rigorous Evidence: A User Friendly Guide;U.S. Department of Education,2003