^Cleveland Johnson (ed.), Orphei Organi Antiqui. Essays in Honor of Harald Vogel. Ithaca: Westfield Center, 2006. Vogel’s early students are identified in the article, “Harald Vogel: Teacher” by Elizabeth Harrison, pp. 9–31.
^Cleveland Johnson, “A Modern Approach to the Historic Organ,” in Early Music,. vol. 8/2, April 1980, pp. 173–177.
^Cleveland Johnson, “Ems-Dollart Region,” in Douglas E. Bush, Richard Kassel (ed.): The Organ. An Encyclopedia. Routledge, New York, London 2006, pp. 170-172.
