Nonfiction:
* The History of the First Church of Christ, Scientist, in Boston, Massachusetts, 1879-1979 (1979): A detailed account of the founding and early development of the Church of Christ, Scientist in Boston.
* Christian Science: A Comprehensive View (1976): An extensive and comprehensive exploration of Christian Science principles and practices.
* Christian Science in the Twentieth Century (1975): An examination of the evolution and impact of Christian Science in the 20th century.
* The History of Christian Science (1967): A historical overview of the origins and development of Christian Science.
Poetry:
* The Glory of the Lord (1987): A collection of poems inspired by Christian Science teachings.
* The Soul's Journey (1982): Poems exploring themes of spirituality and the human condition.
* The Light of Truth (1978): A compilation of poems reflecting on Christian Science concepts.
Other:
* Mary Baker Eddy: A Centennial Biography (1979): A biography of Mary Baker Eddy, the founder of Christian Science.
* The Christian Science Hymnal: A Companion (1979): A companion volume to the Christian Science Hymnal, providing insights into the hymns and their significance.
Covell's works are notable for their depth of research, clarity of presentation, and profound spiritual insights. He is considered a leading authority on Christian Science, and his books continue to be valued resources for students and practitioners of this faith.