Bennett, Andrew & Jeffrey T. Checkel (2014) Process tracing: from philosophical roots to best practices, in Bennett, Andrew; & Jeffrey T. Checkel, eds, Process Tracing: from Metaphor to Analytic Tool. Cambridge: Cambridge University Press (3–37).
Checkel, Jeffrey T. & Andrew Bennett (2014) Beyond metaphors: standards, theory, and the 'where next' for process tracing, in Bennett, Andrew; & Jeffrey T. Checkel, eds, Process Tracing: from Metaphor to Analytic Tool. Cambridge: Cambridge University Press (260–275).