Entry on "Hymn: 4. Hymn Sources and Transmission," Warren Anderson, et al. Grove Music Online보관됨 2013-06-01 - 웨이백 머신 (2007-2009) (subscription required).
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Entry on "Hymn: 4. Hymn Sources and Transmission," Warren Anderson, et al. Grove Music Online보관됨 2013-06-01 - 웨이백 머신 (2007-2009) (subscription required).