Handbooks contain short entries that summarize and define complex research and also highlights important scholars. Use handbooks to get background information, define theories, and find foundational scholars. Scholarly articles published in academic journals present a very small sliver of a large and often complex research topic, so handbooks can be an excellent way to get the bigger picture.
Use the below databases to search through thousands of encyclopedias and handbooks at once.
The Wiley Handbook of Evolutionary Neuroscience by 
The Wiley Handbook of Contextual Behavioral Science by 
The Oxford Handbook of Meditation by