Gleason, R. W. (1968). Contemporary spirituality: Current problems in religious life. Macmillan.
Chicago-viite (17. p.)Gleason, Robert W. Contemporary Spirituality: Current Problems in Religious Life. New York: Macmillan, 1968.
MLA-viite (9. p.)Gleason, Robert W. Contemporary Spirituality: Current Problems in Religious Life. Macmillan, 1968.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.