The following list of journal articles and books provide extended reading on topics covered in chapter 18 in the second edition. Please note that journal articles are free to access, whereas book extracts (denoted by methods.sagepub.com URLs) require your university to have a subscription to SAGE Research Methods.

Boruch, R. F. (1997). Randomised experimentation for planning and evaluation: A practical guide. London: Sage.
This is a book of major importance and should be consulted by anyone interested in intervention within education.