A Chosen Faith by ministers Forrest Church and John Buehrens offers a compelling description of the historical roots of Unitarian Universalist spirituality.
Unitarian Universalist minister Barry Andrews's book Emerson as Spiritual Guide emphasizes the spiritual practices of the Transcendentalists, a spiritual and literary movement that strongly influenced Unitarian Universalist understandings of spirituality.
"Our American Roots," a series of video segments produced by All Souls Unitarian Church in Tulsa, Oklahoma, gives an overview of the historical roots of Unitarian Universalism.
The collection of historical Unitarian Universalist hymns and elements of worship on the website Hymns of the Spirit Three can give readers a sense of the historical roots of our spirituality as expressed through congregational worship. The site is produced independently by a Unitarian Universalist in Washington, D.C.