S. W. Duffield: The Latin Hymn-writers and Their Hymns. Edited and completed by Prof. R. E. Thompson, D. D. New York, 1889.
John Julian: A Dictionary of Hymnology. New York, 1892.
O. Seidensticker: First Century of German Printing in America. Philadelphia, 1893.
J. Tavlor Hamilton: Some Moravian Hymn Writers. (Moravian Visitor, Vol. 3, No. 7.) Easton, 1896.
S. W. Pennypacker: The Settlement of Gcrmantown. Philadelphia, 1899.
M. D. Learned: Historische Anmerkungen. In Americana Germanica. Vol. II., No. 1.
J. Taylor Hamilton: History of the Moravian Church. Bethlehem, 1900.
H. W. Kriebel: The Schwenkfelders in Pennsylvania. Lancaster, 1904.
Corpus Schwenckfeldianorum. Volume I. Leipzig, 1907.
Hallesche Nachrichten. (1750 et seq.)
Blätter fur Hymnologie.
