http://stevenestrella.com/composers/composerfiles/cruger1662.html Biographical data, recommended CDs, books and sheet music, bibliography, and links to biographical essays. http://hymnuts.luthersem.edu/hcompan/writers/cruger_johann.htm Brief biography, educational background, names of those for whom he wrote hymn music, and list of hymn tunes composed by him. http://www.cyberhymnal.org/bio/c/r/cruger_j.htm Biography, portrait, and links to hymn tunes. Includes MIDI audio and scores in NWC format.