Secondary Sources ~ Charles W. Shields

The book of common prayer: as amended by the Westminster Divines, A.D. 1661, [and in agreement with the directory for public worship of the Presbyterian church in the United States] … with a historical and liturgical treatise by Charles W. Shields (DPW)
The Directory of Public Worship and the Book of Common Prayer, considered with reference to the question of a Presbyterian Liturgy by Charles W. Shields (DPW)