These offer overviews to concepts to help orient you to a topic and introduce you to key vocabulary used in the discipline. Entries are often brief, can be authored, and may include short lists of additional references.
You can find encyclopedias and dictionaries using the library's catalog. You can also search in databases that specialize in collecting this type of information.
EXAMPLE
The Evangelical Dictionary of Theology contains an article on evangelism and the Four Spiritual Laws.