Collins' collection Sailing Alone around the Room: New and Selected Poems (2001) includes poems from his previous books of poetry.

J. Gordon Melton has assembled a comprehensive resource for information on a wide range of religious institutions and practices in the United States in The Encyclopedia of American Religions (1999).

Wade Clark Roof's A Generation of Seekers: The Spiritual Journeys of the Baby Boom Generation (1993) charts the varied spiritual explorations of this generation from the 1960s to the 1990s.

Daniel Quinn's Turner Award-winning novel Ishmael (1992) explores the moral and spiritual issues that humanity must engage if it is to survive.