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This source discusses the merits of using a historical approach to policy analysis, by drawing on a case study of the 1996 Personal Responsibility and Work Opportunity Reconciliation Act in the USA. It discusses important issues such as the reliability of historical sources, and the advantages and disadvantages of historical methods, before applying a historical approach to the case study.
http://www.rochester.edu/college/faculty/alexander_lee/wp-content/uploads/2014/07/archives.pdf
This source discusses the usefulness and limitations of archival materials and lays out best practices for using them effectively to test hypotheses in political science.
http://eprints.ncrm.ac.uk/88/1/MethodsReviewPaperNCRM-004.pdf
This article by Fiona Steele discusses event history analysis, as part of the NCRM Methods Review Papers series. It discusses amongst others, the collection and management of data, as well as the various steps in event history analysis, illustrated with examples.
http://people.uncw.edu/pricej/teaching/methods/historical.htm
These notes give an overview of historical-comparative methodologies, including examples of research questions, tips on when to use historical-comparative methods, and key steps in the research process. There is also consideration of ethical issues.
https://www.youtube.com/watch?v=ICUyUNMPGSI
A video lecture on historical and comparative research methods.
Process tracing
https://www.oxfordbibliographies.com/view/document/obo-9780199743292/obo-9780199743292-0227.xml
This very useful site gives an introduction to process tracing and references to lots of further reading on key topics, such as case selection and identifying causal mechanisms. It also lists lots of examples of research that uses process tracing, including examples from politics and international relations.
http://polisci.berkeley.edu/sites/default/files/people/u3827/Understanding%20Process%20Tracing.pdf
This eight-page article outlines the framework of process tracing. It also gives lots of examples to illustrate different types of tests for causal inferences in process tracing.
This article focuses on the method of process tracing. It discusses what constitutes a case and a causal mechanism in process tracing, different types of process tracing, and finally five important steps in process tracing. It uses various examples to illustrate some tests used for process tracing, such as the straw-in-the-wind test, the hoop test, and the smoking gun test.