From inSpirit: The Pocket Guide is one of the most complete introductions to Unitarian Universalism available, covering ministry, worship, religious education, social justice, and history.

Authors: Harris-Perry, M. & Morales, P. 
ISBN-13: ​978-1558966062
Available at the UUA inSpirit Online Bookstore and other booksellers.

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A standard introduction to Unitarian Universalism theology.
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​Authors: Buehrens, J. & Church, F.
​ISBN-10: 0807016179

​Available at the UUA inSpirit Online Bookstore and other booksellers.