1.  Augustus Schultze.  1912.  "Guide to the Old Moravian Cemetery of Bethlehem, Pa., 1742-1910."  Proceedings of the Pennsylvania German Society 21: i-218 (republ. 1983 as pp. 391-583 in Pennsylvania German Church Records.  Vol. 3.  Genealogical Publ. Co., Baltimore, MD; issued 1996 as Broderbund CD-130).  On p. 405:

ROW II.--MOSTLY UNMARRIED MEN... JOHN KAPP, 1735-59, a youth from Switzerland.  He led a happy life of simple-hearted faith and Christian fellowship with his Brethren.