Historians rely on primary and secondary sources when conducting research and writing historical works. They also use qualitative and/or quantitative research methods to support their arguments and conclusions.
Here are some sources about research design and writing:
Provides complete full-text access to the 15th and 16th editions of The Chicago Manual of Style as well as the Chicago Style Q&A. Also provides access to the Chicago-Style Citation Quick Guide for examples of how to use Chicago-style citation.