Choosing the best sources for writing can be a challenging task. Understanding evidence-based medicine, or EBM, can shed some light regarding the quality and reliability of sources.
EBM is defined and explained on the KT Clearinghouse site (or Knowledge Transfer clearinghouse). This site is funded by the Canadian Institute of Health and Research (CIHR). Access the Centre for Evidence-Based Medicine and learn about the “Criteria for Inclusion of Evidence Resources“. Others links will lead you to various resources (textbooks, journals, CDs, and websites).