Hi Kyle, just wondering if the book below is wrongly placed in Bible Commentaries... I recognise that it has significant biblical milestones, especially with John's Gospel, but it still seems to me like it should either be a Biblical Theology or more likely, a Monograph.
Cullmann, Oscar. Early Christian Worship. Edited by Peter R. Ackroyd, James Barr, C. F. Evans, Floyd V. Filson, and C. F. D. Moule. Translated by A. Stewart Todd and James B. Torrance. Studies in Biblical Theology. London: SCM Press Ltd, 1953.